GnuBook/GnuBook.js

   1 /*
   2 Copyright(c)2008 Internet Archive. Software license AGPL version 3.
   3
   4 This file is part of GnuBook.
   5
   6     GnuBook is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU Affero General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     GnuBook is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU Affero General Public License for more details.
  15
  16     You should have received a copy of the GNU Affero General Public License
  17     along with GnuBook.  If not, see <http://www.gnu.org/licenses/>.
  18
  19     The GnuBook source is hosted at http://github.com/openlibrary/bookreader/
  20
  21     archive.org cvs $Revision: 1.58 $ $Date: 2008-11-03 22:25:40 $
  22 */
  23
  24 // GnuBook()
  25 //______________________________________________________________________________
  26 // After you instantiate this object, you must supply the following
  27 // book-specific functions, before calling init():
  28 //  - getPageWidth()
  29 //  - getPageHeight()
  30 //  - getPageURI()
  31 // You must also add a numLeafs property before calling init().
  32
  33 function GnuBook() {
  34     this.reduce  = 4;
  35     this.padding = 10;
  36     this.mode    = 1; //1 or 2
  37
  38     this.displayedLeafs = [];
  39     //this.leafsToDisplay = [];
  40     this.imgs = {};
  41     this.prefetchedImgs = {}; //an object with numeric keys cooresponding to leafNum
  42
  43     this.timer     = null;
  44     this.animating = false;
  45     this.auto      = false;
  46     this.autoTimer = null;
  47     this.flipSpeed = 'fast';
  48
  49     this.twoPagePopUp = null;
  50     this.leafEdgeTmp  = null;
  51
  52     this.searchResults = {};
  53
  54     this.firstIndex = null;
  55
  56 };
  57
  58 // init()
  59 //______________________________________________________________________________
  60 GnuBook.prototype.init = function() {
  61
  62     var startLeaf = window.location.hash;
  63     var title = this.bookTitle.substr(0,50);
  64     if (this.bookTitle.length>50) title += '...';
  65
  66     $("#GnuBook").empty();
  67     $("#GnuBook").append("<div id='GBtoolbar'><span style='float:left;'><button class='GBicon' id='zoom_out' onclick='gb.zoom1up(-1); return false;'/> <button class='GBicon' id='zoom_in' onclick='gb.zoom1up(1); return false;'/> zoom: <span id='GBzoom'>25</span>% <button class='GBicon' id='script' onclick='gb.switchMode(1); return false;'/> <button class='GBicon' id='book_open' onclick='gb.switchMode(2); return false;'/>  &nbsp;&nbsp; <a href='"+this.bookUrl+"' target='_blank'>"+title+"</a></span></div>");
  68     $("#GBtoolbar").append("<form class='GBpageform' action='javascript:' onsubmit='gb.jumpToPage(this.elements[0].value)'><button class='GBicon' id='page_code' onclick='gb.showEmbedCode(); return false;'/> page:<input id='GBpagenum' type='text' size='3' onfocus='gb.autoStop();'></input> <button class='GBicon' id='book_previous' onclick='gb.prev(); return false;'/> <button class='GBicon' id='book_next' onclick='gb.next(); return false;'/> <button class='GBicon play' id='autoImg' onclick='gb.autoToggle(); return false;'/></form>");
  69     $("#GnuBook").append("<div id='GBcontainer'></div>");
  70     $("#GBcontainer").append("<div id='GBpageview'></div>");
  71
  72     $("#GBcontainer").bind('scroll', this, function(e) {
  73         e.data.loadLeafs();
  74     });
  75
  76     this.setupKeyListeners();
  77
  78     $(window).bind('resize', this, function(e) {
  79         //console.log('resize!');
  80         if (1 == e.data.mode) {
  81             //console.log('centering 1page view');
  82             e.data.centerPageView();
  83             $('#GBpageview').empty()
  84             e.data.displayedLeafs = [];
  85             e.data.updateSearchHilites(); //deletes hilights but does not call remove()
  86             e.data.loadLeafs();
  87         } else {
  88             //console.log('drawing 2 page view');
  89             e.data.prepareTwoPageView();
  90         }
  91     });
  92
  93     if (1 == this.mode) {
  94         this.resizePageView();
  95
  96         if ('' != startLeaf) {
  97             this.jumpToIndex(parseInt(startLeaf.substr(1)));
  98             //alert('jump to ' + startLeaf);
  99         }
 100     } else {
 101         this.displayedLeafs=[0];
 102         this.prepareTwoPageView();
 103         //if (this.auto) this.nextPage();
 104     }
 105 }
 106
 107 GnuBook.prototype.setupKeyListeners = function() {
 108     var self = this;
 109
 110     var KEY_PGUP = 33;
 111     var KEY_PGDOWN = 34;
 112     var KEY_END = 35;
 113     var KEY_HOME = 36;
 114
 115     var KEY_LEFT = 37;
 116     var KEY_UP = 38;
 117     var KEY_RIGHT = 39;
 118     var KEY_DOWN = 40;
 119
 120     $(window).keypress(function(e) {
 121         switch(e.keyCode) {
 122             case KEY_PGUP:
 123                 self.prev();
 124                 break;
 125             case KEY_PGDOWN:
 126                 self.next();
 127                 break;
 128             case KEY_END:
 129                 self.end();
 130                 break;
 131             case KEY_HOME:
 132                 self.home();
 133                 break;
 134             case KEY_UP:
 135             case KEY_LEFT:
 136                 if (2 == self.mode)
 137                     self.prev();
 138                 break;
 139             case KEY_DOWN:
 140             case KEY_RIGHT:
 141                 if (2 == self.mode)
 142                     self.next();
 143                 break;
 144         }
 145     });
 146 }
 147
 148 // drawLeafs()
 149 //______________________________________________________________________________
 150 GnuBook.prototype.drawLeafs = function() {
 151     if (1 == this.mode) {
 152         this.drawLeafsOnePage();
 153     } else {
 154         this.drawLeafsTwoPage();
 155     }
 156 }
 157
 158
 159 // drawLeafsOnePage()
 160 //______________________________________________________________________________
 161 GnuBook.prototype.drawLeafsOnePage = function() {
 162     //alert('drawing leafs!');
 163     this.timer = null;
 164
 165
 166     var scrollTop = $('#GBcontainer').attr('scrollTop');
 167     var scrollBottom = scrollTop + $('#GBcontainer').height();
 168     //console.log('top=' + scrollTop + ' bottom='+scrollBottom);
 169
 170     var leafsToDisplay = [];
 171
 172     var i;
 173     var leafTop = 0;
 174     var leafBottom = 0;
 175     for (i=0; i<this.numLeafs; i++) {
 176         var height  = parseInt(this.getPageHeight(i)/this.reduce);
 177
 178         leafBottom += height;
 179         //console.log('leafTop = '+leafTop+ ' pageH = ' + this.pageH[i] + 'leafTop>=scrollTop=' + (leafTop>=scrollTop));
 180         var topInView    = (leafTop >= scrollTop) && (leafTop <= scrollBottom);
 181         var bottomInView = (leafBottom >= scrollTop) && (leafBottom <= scrollBottom);
 182         var middleInView = (leafTop <=scrollTop) && (leafBottom>=scrollBottom);
 183         if (topInView | bottomInView | middleInView) {
 184             //console.log('to display: ' + i);
 185             leafsToDisplay.push(i);
 186         }
 187         leafTop += height +10;
 188         leafBottom += 10;
 189     }
 190
 191     var firstLeafToDraw  = leafsToDisplay[0];
 192     window.location.hash = firstLeafToDraw;
 193     this.firstIndex      = firstLeafToDraw;
 194
 195     if ((0 != firstLeafToDraw) && (1 < this.reduce)) {
 196         firstLeafToDraw--;
 197         leafsToDisplay.unshift(firstLeafToDraw);
 198     }
 199
 200     var lastLeafToDraw = leafsToDisplay[leafsToDisplay.length-1];
 201     if ( ((this.numLeafs-1) != lastLeafToDraw) && (1 < this.reduce) ) {
 202         leafsToDisplay.push(lastLeafToDraw+1);
 203     }
 204
 205     leafTop = 0;
 206     var i;
 207     for (i=0; i<firstLeafToDraw; i++) {
 208         leafTop += parseInt(this.getPageHeight(i)/this.reduce) +10;
 209     }
 210
 211     //var viewWidth = $('#GBpageview').width(); //includes scroll bar width
 212     var viewWidth = $('#GBcontainer').attr('scrollWidth');
 213
 214
 215     for (i=0; i<leafsToDisplay.length; i++) {
 216         var leafNum = leafsToDisplay[i];
 217         var height  = parseInt(this.getPageHeight(leafNum)/this.reduce);
 218
 219         if(-1 == jQuery.inArray(leafsToDisplay[i], this.displayedLeafs)) {
 220             var width   = parseInt(this.getPageWidth(leafNum)/this.reduce);
 221             //console.log("displaying leaf " + leafsToDisplay[i] + ' leafTop=' +leafTop);
 222             var div = document.createElement("div");
 223             div.className = 'GBpagediv1up';
 224             div.id = 'pagediv'+leafNum;
 225             div.style.position = "absolute";
 226             $(div).css('top', leafTop + 'px');
 227             var left = (viewWidth-width)>>1;
 228             if (left<0) left = 0;
 229             $(div).css('left', left+'px');
 230             $(div).css('width', width+'px');
 231             $(div).css('height', height+'px');
 232             //$(div).text('loading...');
 233
 234             $('#GBpageview').append(div);
 235
 236             var img = document.createElement("img");
 237             img.src = this.getPageURI(leafNum);
 238             $(img).css('width', width+'px');
 239             $(img).css('height', height+'px');
 240             $(div).append(img);
 241
 242         } else {
 243             //console.log("not displaying " + leafsToDisplay[i] + ' score=' + jQuery.inArray(leafsToDisplay[i], this.displayedLeafs));
 244         }
 245
 246         leafTop += height +10;
 247
 248     }
 249
 250     for (i=0; i<this.displayedLeafs.length; i++) {
 251         if (-1 == jQuery.inArray(this.displayedLeafs[i], leafsToDisplay)) {
 252             var leafNum = this.displayedLeafs[i];
 253             //console.log('Removing leaf ' + leafNum);
 254             //console.log('id='+'#pagediv'+leafNum+ ' top = ' +$('#pagediv'+leafNum).css('top'));
 255             $('#pagediv'+leafNum).remove();
 256         } else {
 257             //console.log('NOT Removing leaf ' + this.displayedLeafs[i]);
 258         }
 259     }
 260
 261     this.displayedLeafs = leafsToDisplay.slice();
 262     this.updateSearchHilites();
 263
 264     if (null != this.getPageNum(firstLeafToDraw))  {
 265         $("#GBpagenum").val(this.getPageNum(firstLeafToDraw));
 266     } else {
 267         $("#GBpagenum").val('');
 268     }
 269 }
 270
 271 // drawLeafsTwoPage()
 272 //______________________________________________________________________________
 273 GnuBook.prototype.drawLeafsTwoPage = function() {
 274     //alert('drawing two leafs!');
 275
 276     var scrollTop = $('#GBcontainer').attr('scrollTop');
 277     var scrollBottom = scrollTop + $('#GBcontainer').height();
 278     var leafNum = this.currentLeafL;
 279     var height  = this.getPageHeight(leafNum);
 280     var width   = this.getPageWidth(leafNum);
 281     var handSide= this.getPageSide(leafNum);
 282
 283     var leafEdgeWidthL = parseInt( (leafNum/this.numLeafs)*this.twoPageEdgeW );
 284     var leafEdgeWidthR = this.twoPageEdgeW - leafEdgeWidthL;
 285     var divWidth = this.twoPageW*2+20 + this.twoPageEdgeW;
 286     var divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 287     //console.log(leafEdgeWidthL);
 288
 289     var middle = ($('#GBcontainer').width() >> 1);
 290     var left = middle - this.twoPageW;
 291     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
 292
 293     var scaledW = parseInt(this.twoPageH*width/height);
 294     left = 10+leafEdgeWidthL;
 295     //var right = left+scaledW;
 296     var right = $(this.twoPageDiv).width()-11-$(this.leafEdgeL).width()-scaledW;
 297
 298     var gutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
 299
 300
 301     this.prefetchImg(leafNum);
 302     $(this.prefetchedImgs[leafNum]).css({
 303         position: 'absolute',
 304         /*right:   gutter+'px',*/
 305         left: gutter-scaledW+'px',
 306         top:    top+'px',
 307         backgroundColor: 'rgb(234, 226, 205)',
 308         height: this.twoPageH +'px',
 309         width:  scaledW + 'px',
 310         borderRight: '1px solid black',
 311         zIndex: 2
 312     }).appendTo('#GBcontainer');
 313     //$('#GBcontainer').append(this.prefetchedImgs[leafNum]);
 314
 315
 316     var leafNum = this.currentLeafR;
 317     var height  = this.getPageHeight(leafNum);
 318     var width   = this.getPageWidth(leafNum);
 319     //    var left = ($('#GBcontainer').width() >> 1);
 320     left += scaledW;
 321
 322     var scaledW = this.twoPageH*width/height;
 323     this.prefetchImg(leafNum);
 324     $(this.prefetchedImgs[leafNum]).css({
 325         position: 'absolute',
 326         left:   gutter+'px',
 327         top:    top+'px',
 328         backgroundColor: 'rgb(234, 226, 205)',
 329         height: this.twoPageH + 'px',
 330         width:  scaledW + 'px',
 331         borderLeft: '1px solid black',
 332         zIndex: 2
 333     }).appendTo('#GBcontainer');
 334     //$('#GBcontainer').append(this.prefetchedImgs[leafNum]);
 335
 336
 337     this.displayedLeafs = [this.currentLeafL, this.currentLeafR];
 338     this.setClickHandlers();
 339
 340     this.updatePageNumBox2UP();
 341 }
 342
 343 // updatePageNumBox2UP
 344 //______________________________________________________________________________
 345 GnuBook.prototype.updatePageNumBox2UP = function() {
 346     if (null != this.getPageNum(this.currentLeafL))  {
 347         $("#GBpagenum").val(this.getPageNum(this.currentLeafL));
 348     } else {
 349         $("#GBpagenum").val('');
 350     }
 351     window.location.hash = this.currentLeafL;
 352 }
 353
 354 // loadLeafs()
 355 //______________________________________________________________________________
 356 GnuBook.prototype.loadLeafs = function() {
 357
 358
 359     var self = this;
 360     if (null == this.timer) {
 361         this.timer=setTimeout(function(){self.drawLeafs()},250);
 362     } else {
 363         clearTimeout(this.timer);
 364         this.timer=setTimeout(function(){self.drawLeafs()},250);
 365     }
 366 }
 367
 368
 369 // zoom1up()
 370 //______________________________________________________________________________
 371 GnuBook.prototype.zoom1up = function(dir) {
 372     if (2 == this.mode) {     //can only zoom in 1-page mode
 373         this.switchMode(1);
 374         return;
 375     }
 376
 377     if (1 == dir) {
 378         if (this.reduce <= 0.5) return;
 379         this.reduce*=0.5;           //zoom in
 380     } else {
 381         if (this.reduce >= 8) return;
 382         this.reduce*=2;             //zoom out
 383     }
 384
 385     this.resizePageView();
 386
 387     $('#GBpageview').empty()
 388     this.displayedLeafs = [];
 389     this.loadLeafs();
 390
 391     $('#GBzoom').text(100/this.reduce);
 392 }
 393
 394
 395 // resizePageView()
 396 //______________________________________________________________________________
 397 GnuBook.prototype.resizePageView = function() {
 398     var i;
 399     var viewHeight = 0;
 400     //var viewWidth  = $('#GBcontainer').width(); //includes scrollBar
 401     var viewWidth  = $('#GBcontainer').attr('clientWidth');
 402
 403     var oldScrollTop  = $('#GBcontainer').attr('scrollTop');
 404     var oldViewHeight = $('#GBpageview').height();
 405     if (0 != oldViewHeight) {
 406         var scrollRatio = oldScrollTop / oldViewHeight;
 407     } else {
 408         var scrollRatio = 0;
 409     }
 410
 411     for (i=0; i<this.numLeafs; i++) {
 412         viewHeight += parseInt(this.getPageHeight(i)/this.reduce) + this.padding;
 413         var width = parseInt(this.getPageWidth(i)/this.reduce);
 414         if (width>viewWidth) viewWidth=width;
 415     }
 416     $('#GBpageview').height(viewHeight);
 417     $('#GBpageview').width(viewWidth);
 418
 419     $('#GBcontainer').attr('scrollTop', Math.floor(scrollRatio*viewHeight));
 420
 421     this.centerPageView();
 422     this.loadLeafs();
 423
 424 }
 425
 426 // centerPageView()
 427 //______________________________________________________________________________
 428 GnuBook.prototype.centerPageView = function() {
 429
 430     var scrollWidth  = $('#GBcontainer').attr('scrollWidth');
 431     var clientWidth  =  $('#GBcontainer').attr('clientWidth');
 432     //console.log('sW='+scrollWidth+' cW='+clientWidth);
 433     if (scrollWidth > clientWidth) {
 434         $('#GBcontainer').attr('scrollLeft', (scrollWidth-clientWidth)/2);
 435     }
 436
 437 }
 438
 439 // jumpToPage()
 440 //______________________________________________________________________________
 441 GnuBook.prototype.jumpToPage = function(pageNum) {
 442     //if (2 == this.mode) return;
 443
 444     var i;
 445     var foundPage = false;
 446     var foundLeaf = null;
 447     for (i=0; i<this.numLeafs; i++) {
 448         if (this.getPageNum(i) == pageNum) {
 449             foundPage = true;
 450             foundLeaf = i;
 451             break;
 452         }
 453     }
 454
 455     if (foundPage) {
 456         var leafTop = 0;
 457         var h;
 458         this.jumpToIndex(foundLeaf);
 459         $('#GBcontainer').attr('scrollTop', leafTop);
 460     } else {
 461         alert('Page not found. This book might not have pageNumbers in scandata.');
 462     }
 463 }
 464
 465 // jumpToIndex()
 466 //______________________________________________________________________________
 467 GnuBook.prototype.jumpToIndex = function(index) {
 468     if (2 == this.mode) {
 469         this.autoStop();
 470         if (index<this.currentLeafL) {
 471             if ('L' == this.getPageSide(index)) {
 472                 this.flipBackToIndex(index);
 473             } else {
 474                 this.flipBackToIndex(index-1);
 475             }
 476         } else if (index>this.currentLeafR) {
 477             if ('R' == this.getPageSide(index)) {
 478                 this.flipFwdToIndex(index);
 479             } else {
 480                 this.flipFwdToIndex(index+1);
 481             }
 482         }
 483
 484     } else {
 485         var i;
 486         var leafTop = 0;
 487         var h;
 488         for (i=0; i<index; i++) {
 489             h = parseInt(this.getPageHeight(i)/this.reduce);
 490             leafTop += h + this.padding;
 491         }
 492         //$('#GBcontainer').attr('scrollTop', leafTop);
 493         $('#GBcontainer').animate({scrollTop: leafTop}, 'fast');
 494     }
 495 }
 496
 497
 498
 499 // switchMode()
 500 //______________________________________________________________________________
 501 GnuBook.prototype.switchMode = function(mode) {
 502     if (mode == this.mode) return;
 503
 504     this.autoStop();
 505     this.removeSearchHilites();
 506
 507     this.mode = mode;
 508     if (1 == mode) {
 509         this.prepareOnePageView();
 510     } else {
 511         this.prepareTwoPageView();
 512     }
 513
 514 }
 515
 516 //prepareOnePageView()
 517 //______________________________________________________________________________
 518 GnuBook.prototype.prepareOnePageView = function() {
 519
 520     var startLeaf = this.displayedLeafs[0];
 521
 522     $('#GBcontainer').empty();
 523     $('#GBcontainer').css({
 524         overflowY: 'scroll',
 525         overflowX: 'auto'
 526     });
 527
 528     $("#GBcontainer").append("<div id='GBpageview'></div>");
 529     this.resizePageView();
 530     this.jumpToIndex(startLeaf);
 531     this.displayedLeafs = [];
 532     this.drawLeafsOnePage();
 533     $('#GBzoom').text(100/this.reduce);
 534 }
 535
 536 // prepareTwoPageView()
 537 //______________________________________________________________________________
 538 GnuBook.prototype.prepareTwoPageView = function() {
 539     $('#GBcontainer').empty();
 540
 541     var firstLeaf = this.displayedLeafs[0];
 542     if ('R' == this.getPageSide(firstLeaf)) {
 543         if (0 == firstLeaf) {
 544             firstLeaf++;
 545         } else {
 546             firstLeaf--;
 547         }
 548     }
 549
 550     this.currentLeafL = null;
 551     this.currentLeafR = null;
 552     this.pruneUnusedImgs();
 553
 554     this.currentLeafL = firstLeaf;
 555     this.currentLeafR = firstLeaf + 1;
 556
 557     this.calculateSpreadSize(); //sets this.twoPageW, twoPageH, and twoPageRatio
 558
 559     var middle = ($('#GBcontainer').width() >> 1);
 560     var gutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
 561     var scaledWL = this.getPageWidth2UP(this.currentLeafL);
 562     var scaledWR = this.getPageWidth2UP(this.currentLeafR);
 563     var leafEdgeWidthL = parseInt( (firstLeaf/this.numLeafs)*this.twoPageEdgeW );
 564     var leafEdgeWidthR = this.twoPageEdgeW - leafEdgeWidthL;
 565
 566     //console.log('idealWidth='+idealWidth+' idealHeight='+idealHeight);
 567     //var divWidth = this.twoPageW*2+20 + this.twoPageEdgeW;
 568     var divWidth = scaledWL + scaledWR + 20 + this.twoPageEdgeW;
 569     var divHeight = this.twoPageH+20;
 570     //var divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 571     var divLeft = gutter-scaledWL-leafEdgeWidthL-10;
 572     var divTop = ($('#GBcontainer').height() - divHeight) >> 1;
 573     //console.log('divWidth='+divWidth+' divHeight='+divHeight+ ' divLeft='+divLeft+' divTop='+divTop);
 574
 575     this.twoPageDiv = document.createElement('div');
 576     $(this.twoPageDiv).attr('id', 'book_div_1').css({
 577         border: '1px solid rgb(68, 25, 17)',
 578         width:  divWidth + 'px',
 579         height: divHeight+'px',
 580         visibility: 'visible',
 581         position: 'absolute',
 582         backgroundColor: 'rgb(136, 51, 34)',
 583         left: divLeft + 'px',
 584         top: divTop+'px',
 585         MozBorderRadiusTopleft: '7px',
 586         MozBorderRadiusTopright: '7px',
 587         MozBorderRadiusBottomright: '7px',
 588         MozBorderRadiusBottomleft: '7px'
 589     }).appendTo('#GBcontainer');
 590     //$('#GBcontainer').append('<div id="book_div_1" style="border: 1px solid rgb(68, 25, 17); width: ' + divWidth + 'px; height: '+divHeight+'px; visibility: visible; position: absolute; background-color: rgb(136, 51, 34); left: ' + divLeft + 'px; top: '+divTop+'px; -moz-border-radius-topleft: 7px; -moz-border-radius-topright: 7px; -moz-border-radius-bottomright: 7px; -moz-border-radius-bottomleft: 7px;"/>');
 591
 592
 593     var height  = this.getPageHeight(this.currentLeafR);
 594     var width   = this.getPageWidth(this.currentLeafR);
 595     var scaledW = this.twoPageH*width/height;
 596
 597     this.leafEdgeR = document.createElement('div');
 598     $(this.leafEdgeR).css({
 599         borderStyle: 'solid solid solid none',
 600         borderColor: 'rgb(51, 51, 34)',
 601         borderWidth: '1px 1px 1px 0px',
 602         background: 'transparent url(http://www.us.archive.org/GnuBook/images/right-edges.png) repeat scroll 0% 0%',
 603         width: leafEdgeWidthR + 'px',
 604         height: this.twoPageH-1 + 'px',
 605         /*right: '10px',*/
 606         left: gutter+scaledW+'px',
 607         top: divTop+10+'px',
 608         position: 'absolute'
 609     }).appendTo('#GBcontainer');
 610
 611     this.leafEdgeL = document.createElement('div');
 612     $(this.leafEdgeL).css({
 613         borderStyle: 'solid none solid solid',
 614         borderColor: 'rgb(51, 51, 34)',
 615         borderWidth: '1px 0px 1px 1px',
 616         background: 'transparent url(http://www.us.archive.org/GnuBook/images/left-edges.png) repeat scroll 0% 0%',
 617         width: leafEdgeWidthL + 'px',
 618         height: this.twoPageH-1 + 'px',
 619         left: divLeft+10+'px',
 620         top: divTop+10+'px',
 621         position: 'absolute'
 622     }).appendTo('#GBcontainer');
 623
 624
 625
 626     divWidth = 30;
 627     divHeight = this.twoPageH+20;
 628     divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 629     divTop = ($('#GBcontainer').height() - divHeight) >> 1;
 630
 631     div = document.createElement('div');
 632     $(div).attr('id', 'book_div_2').css({
 633         border:          '1px solid rgb(68, 25, 17)',
 634         width:           divWidth+'px',
 635         height:          divHeight+'px',
 636         position:        'absolute',
 637         backgroundColor: 'rgb(68, 25, 17)',
 638         left:            divLeft+'px',
 639         top:             divTop+'px'
 640     }).appendTo('#GBcontainer');
 641     //$('#GBcontainer').append('<div id="book_div_2" style="border: 1px solid rgb(68, 25, 17); width: '+divWidth+'px; height: '+divHeight+'px; visibility: visible; position: absolute; background-color: rgb(68, 25, 17); left: '+divLeft+'px; top: '+divTop+'px;"/>');
 642
 643     divWidth = this.twoPageW*2;
 644     divHeight = this.twoPageH;
 645     divLeft = ($('#GBcontainer').width() - divWidth) >> 1;
 646     divTop = ($('#GBcontainer').height() - divHeight) >> 1;
 647
 648
 649     this.prepareTwoPagePopUp();
 650
 651     this.displayedLeafs = [];
 652     //this.leafsToDisplay=[firstLeaf, firstLeaf+1];
 653     //console.log('leafsToDisplay: ' + this.leafsToDisplay[0] + ' ' + this.leafsToDisplay[1]);
 654     this.drawLeafsTwoPage();
 655     this.updateSearchHilites2UP();
 656
 657     this.prefetch();
 658     $('#GBzoom').text((100*this.twoPageH/this.getPageHeight(firstLeaf)).toString().substr(0,4));
 659 }
 660
 661 // prepareTwoPagePopUp()
 662 //______________________________________________________________________________
 663 GnuBook.prototype.prepareTwoPagePopUp = function() {
 664     this.twoPagePopUp = document.createElement('div');
 665     $(this.twoPagePopUp).css({
 666         border: '1px solid black',
 667         padding: '2px 6px',
 668         position: 'absolute',
 669         fontFamily: 'sans-serif',
 670         fontSize: '14px',
 671         zIndex: '1000',
 672         backgroundColor: 'rgb(255, 255, 238)',
 673         opacity: 0.85
 674     }).appendTo('#GBcontainer');
 675     $(this.twoPagePopUp).hide();
 676
 677     $(this.leafEdgeL).add(this.leafEdgeR).bind('mouseenter', this, function(e) {
 678         $(e.data.twoPagePopUp).show();
 679     });
 680
 681     $(this.leafEdgeL).add(this.leafEdgeR).bind('mouseleave', this, function(e) {
 682         $(e.data.twoPagePopUp).hide();
 683     });
 684
 685     $(this.leafEdgeL).bind('click', this, function(e) {
 686         e.data.autoStop();
 687         var jumpIndex = e.data.currentLeafL - ($(e.data.leafEdgeL).offset().left + $(e.data.leafEdgeL).width() - e.pageX) * 10;
 688         jumpIndex = Math.max(jumpIndex, 0);
 689         e.data.flipBackToIndex(jumpIndex);
 690
 691     });
 692
 693     $(this.leafEdgeR).bind('click', this, function(e) {
 694         e.data.autoStop();
 695         var jumpIndex = e.data.currentLeafR + (e.pageX - $(e.data.leafEdgeR).offset().left) * 10;
 696         jumpIndex = Math.max(jumpIndex, 0);
 697         e.data.flipFwdToIndex(jumpIndex);
 698
 699     });
 700
 701     $(this.leafEdgeR).bind('mousemove', this, function(e) {
 702
 703         var jumpLeaf = e.data.currentLeafR + (e.pageX - $(e.data.leafEdgeR).offset().left) * 10;
 704         jumpLeaf = Math.min(jumpLeaf, e.data.numLeafs-1);
 705         $(e.data.twoPagePopUp).text('View Leaf '+jumpLeaf);
 706
 707         $(e.data.twoPagePopUp).css({
 708             left: e.pageX +5+ 'px',
 709             top: e.pageY-$('#GBcontainer').offset().top+ 'px'
 710         });
 711     });
 712
 713     $(this.leafEdgeL).bind('mousemove', this, function(e) {
 714         var jumpLeaf = e.data.currentLeafL - ($(e.data.leafEdgeL).offset().left + $(e.data.leafEdgeL).width() - e.pageX) * 10;
 715         jumpLeaf = Math.max(jumpLeaf, 0);
 716         $(e.data.twoPagePopUp).text('View Leaf '+jumpLeaf);
 717
 718         $(e.data.twoPagePopUp).css({
 719             left: e.pageX - $(e.data.twoPagePopUp).width() - 30 + 'px',
 720             top: e.pageY-$('#GBcontainer').offset().top+ 'px'
 721         });
 722     });
 723 }
 724
 725 // calculateSpreadSize()
 726 //______________________________________________________________________________
 727 // Calculates 2-page spread dimensions based on this.currentLeafL and
 728 // this.currentLeafR
 729 // This function sets this.twoPageH, twoPageW, and twoPageRatio
 730
 731 GnuBook.prototype.calculateSpreadSize = function() {
 732     var firstLeaf  = this.currentLeafL;
 733     var secondLeaf = this.currentLeafR;
 734     //console.log('first page is ' + firstLeaf);
 735
 736     var canon5Dratio = 1.5;
 737
 738     var firstLeafRatio  = this.getPageHeight(firstLeaf) / this.getPageWidth(firstLeaf);
 739     var secondLeafRatio = this.getPageHeight(secondLeaf) / this.getPageWidth(secondLeaf);
 740     //console.log('firstLeafRatio = ' + firstLeafRatio + ' secondLeafRatio = ' + secondLeafRatio);
 741
 742     var ratio;
 743     if (Math.abs(firstLeafRatio - canon5Dratio) < Math.abs(secondLeafRatio - canon5Dratio)) {
 744         ratio = firstLeafRatio;
 745         //console.log('using firstLeafRatio ' + ratio);
 746     } else {
 747         ratio = secondLeafRatio;
 748         //console.log('using secondLeafRatio ' + ratio);
 749     }
 750
 751     var totalLeafEdgeWidth = parseInt(this.numLeafs * 0.1);
 752     var maxLeafEdgeWidth   = parseInt($('#GBcontainer').width() * 0.1);
 753     totalLeafEdgeWidth     = Math.min(totalLeafEdgeWidth, maxLeafEdgeWidth);
 754
 755     $('#GBcontainer').css('overflow', 'hidden');
 756
 757     var idealWidth  = ($('#GBcontainer').width() - 30 - totalLeafEdgeWidth)>>1;
 758     var idealHeight = $('#GBcontainer').height() - 30;
 759     //console.log('init idealWidth='+idealWidth+' idealHeight='+idealHeight + ' ratio='+ratio);
 760
 761     if (idealHeight/ratio <= idealWidth) {
 762         //use height
 763         idealWidth = parseInt(idealHeight/ratio);
 764     } else {
 765         //use width
 766         idealHeight = parseInt(idealWidth*ratio);
 767     }
 768
 769     this.twoPageH     = idealHeight;
 770     this.twoPageW     = idealWidth;
 771     this.twoPageRatio = ratio;
 772     this.twoPageEdgeW = totalLeafEdgeWidth;
 773
 774 }
 775
 776 // next()
 777 //______________________________________________________________________________
 778 GnuBook.prototype.next = function() {
 779     if (2 == this.mode) {
 780         this.autoStop();
 781         this.flipFwdToIndex(null);
 782     } else {
 783         if (this.firstIndex <= (this.numLeafs - 2)) {
 784             this.jumpToIndex(this.firstIndex+1);
 785         }
 786     }
 787 }
 788
 789 // prev()
 790 //______________________________________________________________________________
 791 GnuBook.prototype.prev = function() {
 792     if (2 == this.mode) {
 793         this.autoStop();
 794         this.flipBackToIndex(null);
 795     } else {
 796         if (this.firstIndex >= 1) {
 797             this.jumpToIndex(this.firstIndex-1);
 798         }
 799     }
 800 }
 801
 802 GnuBook.prototype.home = function() {
 803     if (2 == this.mode) {
 804         this.jumpToIndex(2);
 805     }
 806     else {
 807         this.jumpToIndex(0);
 808     }
 809 }
 810
 811 GnuBook.prototype.end = function() {
 812     if (2 == this.mode) {
 813         this.jumpToIndex(this.numLeafs-5);
 814     }
 815     else {
 816         this.jumpToIndex(this.numLeafs-1);
 817     }
 818 }
 819
 820 // flipBackToIndex()
 821 //______________________________________________________________________________
 822 // to flip back one spread, pass index=null
 823 GnuBook.prototype.flipBackToIndex = function(index) {
 824     if (1 == this.mode) return;
 825
 826     var leftIndex = this.currentLeafL;
 827     if (leftIndex <= 2) return;
 828     if (this.animating) return;
 829
 830     if (null != this.leafEdgeTmp) {
 831         alert('error: leafEdgeTmp should be null!');
 832         return;
 833     }
 834
 835     if (null == index) {
 836         index = leftIndex-2;
 837     }
 838     if (index<0) return;
 839
 840     if ('L' !=  this.getPageSide(index)) {
 841         alert('img with index ' + index + ' is not a left-hand page');
 842         return;
 843     }
 844
 845     this.animating = true;
 846
 847     var prevL = index;
 848     var prevR = index+1;
 849
 850     var gutter= this.prepareFlipBack(prevL, prevR);
 851
 852     var leftLeaf = this.currentLeafL;
 853
 854     var oldLeafEdgeWidthL = parseInt( (this.currentLeafL/this.numLeafs)*this.twoPageEdgeW );
 855     var newLeafEdgeWidthL = parseInt( (index            /this.numLeafs)*this.twoPageEdgeW );
 856     var leafEdgeTmpW = oldLeafEdgeWidthL - newLeafEdgeWidthL;
 857
 858     var scaledWL = this.getPageWidth2UP(prevL);
 859
 860     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
 861
 862     this.leafEdgeTmp = document.createElement('div');
 863     $(this.leafEdgeTmp).css({
 864         borderStyle: 'solid none solid solid',
 865         borderColor: 'rgb(51, 51, 34)',
 866         borderWidth: '1px 0px 1px 1px',
 867         background: 'transparent url(http://www.us.archive.org/GnuBook/images/left-edges.png) repeat scroll 0% 0%',
 868         width: leafEdgeTmpW + 'px',
 869         height: this.twoPageH-1 + 'px',
 870         left: gutter-scaledWL+10+newLeafEdgeWidthL+'px',
 871         top: top+'px',
 872         position: 'absolute',
 873         zIndex:1000
 874     }).appendTo('#GBcontainer');
 875
 876     //$(this.leafEdgeL).css('width', newLeafEdgeWidthL+'px');
 877     $(this.leafEdgeL).css({
 878         width: newLeafEdgeWidthL+'px',
 879         left: gutter-scaledWL-newLeafEdgeWidthL+'px'
 880     });
 881
 882     var left = $(this.prefetchedImgs[leftLeaf]).offset().left;
 883     var right = $('#GBcontainer').width()-left-$(this.prefetchedImgs[leftLeaf]).width()+$('#GBcontainer').offset().left-2+'px';
 884     $(this.prefetchedImgs[leftLeaf]).css({
 885         right: right,
 886         left: null
 887     });
 888
 889      left = $(this.prefetchedImgs[leftLeaf]).offset().left - $('#book_div_1').offset().left;
 890      right = left+$(this.prefetchedImgs[leftLeaf]).width()+'px';
 891
 892     $(this.leafEdgeTmp).animate({left: gutter}, this.flipSpeed, 'easeInSine');
 893     //$(this.prefetchedImgs[leftLeaf]).animate({width: '0px'}, 'slow', 'easeInSine');
 894
 895     var scaledWR = this.getPageWidth2UP(prevR);
 896
 897     var self = this;
 898
 899     this.removeSearchHilites();
 900
 901     $(this.prefetchedImgs[leftLeaf]).animate({width: '0px'}, self.flipSpeed, 'easeInSine', function() {
 902         $(self.leafEdgeTmp).animate({left: gutter+scaledWR+'px'}, self.flipSpeed, 'easeOutSine');
 903         $(self.prefetchedImgs[prevR]).animate({width: scaledWR+'px'}, self.flipSpeed, 'easeOutSine', function() {
 904             $(self.prefetchedImgs[prevL]).css('zIndex', 2);
 905
 906             $(self.leafEdgeR).css({
 907                 width: self.twoPageEdgeW-newLeafEdgeWidthL+'px',
 908                 left:  gutter+scaledWR+'px'
 909             });
 910
 911             $(self.twoPageDiv).css({
 912                 width: scaledWL+scaledWR+self.twoPageEdgeW+20+'px',
 913                 left: gutter-scaledWL-newLeafEdgeWidthL-10+'px'
 914             });
 915
 916             $(self.leafEdgeTmp).remove();
 917             self.leafEdgeTmp = null;
 918
 919             self.currentLeafL = prevL;
 920             self.currentLeafR = prevR;
 921             self.displayedLeafs = [prevL, prevR];
 922             self.setClickHandlers();
 923             self.pruneUnusedImgs();
 924             self.prefetch();
 925             self.animating = false;
 926
 927             self.updateSearchHilites2UP();
 928             self.updatePageNumBox2UP();
 929             //$('#GBzoom').text((self.twoPageH/self.getPageHeight(prevL)).toString().substr(0,4));
 930         });
 931     });
 932
 933 }
 934
 935 // flipFwdToIndex()
 936 //______________________________________________________________________________
 937 // to flip forward one spread, pass index=null
 938 GnuBook.prototype.flipFwdToIndex = function(index) {
 939     var rightLeaf = this.currentLeafR;
 940     if (rightLeaf >= this.numLeafs-3) return;
 941
 942     if (this.animating) return;
 943
 944     if (null != this.leafEdgeTmp) {
 945         alert('error: leafEdgeTmp should be null!');
 946         return;
 947     }
 948
 949
 950     if (null == index) {
 951         index = rightLeaf+2;
 952     }
 953     if (index>=this.numLeafs-3) return;
 954
 955     if ('R' !=  this.getPageSide(index)) {
 956         alert('img with index ' + index + ' is not a right-hand page');
 957         return;
 958     }
 959
 960     this.animating = true;
 961
 962     var nextL = index-1;
 963     var nextR = index;
 964
 965     var gutter= this.prepareFlipFwd(nextL, nextR);
 966
 967     var oldLeafEdgeWidthL = parseInt( (this.currentLeafL/this.numLeafs)*this.twoPageEdgeW );
 968     var oldLeafEdgeWidthR = this.twoPageEdgeW-oldLeafEdgeWidthL;
 969     var newLeafEdgeWidthL = parseInt( (nextL            /this.numLeafs)*this.twoPageEdgeW );
 970     var newLeafEdgeWidthR = this.twoPageEdgeW-newLeafEdgeWidthL;
 971
 972     var leafEdgeTmpW = oldLeafEdgeWidthR - newLeafEdgeWidthR;
 973
 974     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
 975
 976     var height  = this.getPageHeight(rightLeaf);
 977     var width   = this.getPageWidth(rightLeaf);
 978     var scaledW = this.twoPageH*width/height;
 979
 980     var middle     = ($('#GBcontainer').width() >> 1);
 981     var currGutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
 982
 983     this.leafEdgeTmp = document.createElement('div');
 984     $(this.leafEdgeTmp).css({
 985         borderStyle: 'solid none solid solid',
 986         borderColor: 'rgb(51, 51, 34)',
 987         borderWidth: '1px 0px 1px 1px',
 988         background: 'transparent url(http://www.us.archive.org/GnuBook/images/left-edges.png) repeat scroll 0% 0%',
 989         width: leafEdgeTmpW + 'px',
 990         height: this.twoPageH-1 + 'px',
 991         left: currGutter+scaledW+'px',
 992         top: top+'px',
 993         position: 'absolute',
 994         zIndex:1000
 995     }).appendTo('#GBcontainer');
 996
 997     var scaledWR = this.getPageWidth2UP(nextR);
 998     $(this.leafEdgeR).css({width: newLeafEdgeWidthR+'px', left: gutter+scaledWR+'px' });
 999
1000     var scaledWL = this.getPageWidth2UP(nextL);
1001
1002     var self = this;
1003
1004     var speed = this.flipSpeed;
1005
1006     this.removeSearchHilites();
1007
1008     $(this.leafEdgeTmp).animate({left: gutter}, speed, 'easeInSine');
1009     $(this.prefetchedImgs[rightLeaf]).animate({width: '0px'}, speed, 'easeInSine', function() {
1010         $(self.leafEdgeTmp).animate({left: gutter-scaledWL-leafEdgeTmpW+'px'}, speed, 'easeOutSine');
1011         $(self.prefetchedImgs[nextL]).animate({width: scaledWL+'px'}, speed, 'easeOutSine', function() {
1012             $(self.prefetchedImgs[nextR]).css('zIndex', 2);
1013
1014             $(self.leafEdgeL).css({
1015                 width: newLeafEdgeWidthL+'px',
1016                 left: gutter-scaledWL-newLeafEdgeWidthL+'px'
1017             });
1018
1019             $(self.twoPageDiv).css({
1020                 width: scaledWL+scaledWR+self.twoPageEdgeW+20+'px',
1021                 left: gutter-scaledWL-newLeafEdgeWidthL-10+'px'
1022             });
1023
1024             $(self.leafEdgeTmp).remove();
1025             self.leafEdgeTmp = null;
1026
1027             self.currentLeafL = nextL;
1028             self.currentLeafR = nextR;
1029             self.displayedLeafs = [nextL, nextR];
1030             self.setClickHandlers();
1031             self.pruneUnusedImgs();
1032             self.prefetch();
1033             self.animating = false;
1034
1035             self.updateSearchHilites2UP();
1036             self.updatePageNumBox2UP();
1037             //$('#GBzoom').text((self.twoPageH/self.getPageHeight(nextL)).toString().substr(0,4));
1038         });
1039     });
1040
1041 }
1042
1043 // setClickHandlers
1044 //______________________________________________________________________________
1045 GnuBook.prototype.setClickHandlers = function() {
1046     var self = this;
1047     $(this.prefetchedImgs[this.currentLeafL]).click(function() {
1048         //self.prevPage();
1049         self.autoStop();
1050         self.flipBackToIndex(null);
1051     });
1052     $(this.prefetchedImgs[this.currentLeafR]).click(function() {
1053         //self.nextPage();'
1054         self.autoStop();
1055         self.flipFwdToIndex(null);
1056     });
1057 }
1058
1059 // prefetchImg()
1060 //______________________________________________________________________________
1061 GnuBook.prototype.prefetchImg = function(leafNum) {
1062     if (undefined == this.prefetchedImgs[leafNum]) {
1063         var img = document.createElement("img");
1064         img.src = this.getPageURI(leafNum);
1065         this.prefetchedImgs[leafNum] = img;
1066     }
1067 }
1068
1069
1070 // prepareFlipBack()
1071 //______________________________________________________________________________
1072 GnuBook.prototype.prepareFlipBack = function(prevL, prevR) {
1073
1074     this.prefetchImg(prevL);
1075     this.prefetchImg(prevR);
1076
1077     var height  = this.getPageHeight(prevL);
1078     var width   = this.getPageWidth(prevL);
1079     var middle = ($('#GBcontainer').width() >> 1);
1080     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1081     var scaledW = this.twoPageH*width/height;
1082
1083     var gutter = middle+parseInt((2*prevL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1084
1085     $(this.prefetchedImgs[prevL]).css({
1086         position: 'absolute',
1087         /*right:   middle+'px',*/
1088         left: gutter-scaledW+'px',
1089         top:    top+'px',
1090         backgroundColor: 'rgb(234, 226, 205)',
1091         height: this.twoPageH,
1092         width:  scaledW+'px',
1093         borderRight: '1px solid black',
1094         zIndex: 1
1095     });
1096
1097     $('#GBcontainer').append(this.prefetchedImgs[prevL]);
1098
1099     $(this.prefetchedImgs[prevR]).css({
1100         position: 'absolute',
1101         left:   gutter+'px',
1102         top:    top+'px',
1103         backgroundColor: 'rgb(234, 226, 205)',
1104         height: this.twoPageH,
1105         width:  '0px',
1106         borderLeft: '1px solid black',
1107         zIndex: 2
1108     });
1109
1110     $('#GBcontainer').append(this.prefetchedImgs[prevR]);
1111
1112
1113     return gutter;
1114
1115 }
1116
1117 // prepareFlipFwd()
1118 //______________________________________________________________________________
1119 GnuBook.prototype.prepareFlipFwd = function(nextL, nextR) {
1120
1121     this.prefetchImg(nextL);
1122     this.prefetchImg(nextR);
1123
1124     var height  = this.getPageHeight(nextR);
1125     var width   = this.getPageWidth(nextR);
1126     var middle = ($('#GBcontainer').width() >> 1);
1127     var top  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1128     var scaledW = this.twoPageH*width/height;
1129
1130     var gutter = middle+parseInt((2*nextL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1131
1132     $(this.prefetchedImgs[nextR]).css({
1133         position: 'absolute',
1134         left:   gutter+'px',
1135         top:    top+'px',
1136         backgroundColor: 'rgb(234, 226, 205)',
1137         height: this.twoPageH,
1138         width:  scaledW+'px',
1139         borderLeft: '1px solid black',
1140         zIndex: 1
1141     });
1142
1143     $('#GBcontainer').append(this.prefetchedImgs[nextR]);
1144
1145     height  = this.getPageHeight(nextL);
1146     width   = this.getPageWidth(nextL);
1147     scaledW = this.twoPageH*width/height;
1148
1149     $(this.prefetchedImgs[nextL]).css({
1150         position: 'absolute',
1151         right:   $('#GBcontainer').width()-gutter+'px',
1152         top:    top+'px',
1153         backgroundColor: 'rgb(234, 226, 205)',
1154         height: this.twoPageH,
1155         width:  0+'px',
1156         borderRight: '1px solid black',
1157         zIndex: 2
1158     });
1159
1160     $('#GBcontainer').append(this.prefetchedImgs[nextL]);
1161
1162     return gutter;
1163
1164 }
1165
1166 // getNextLeafs()
1167 //______________________________________________________________________________
1168 GnuBook.prototype.getNextLeafs = function(o) {
1169     //TODO: we might have two left or two right leafs in a row (damaged book)
1170     //For now, assume that leafs are contiguous.
1171
1172     //return [this.currentLeafL+2, this.currentLeafL+3];
1173     o.L = this.currentLeafL+2;
1174     o.R = this.currentLeafL+3;
1175 }
1176
1177 // getprevLeafs()
1178 //______________________________________________________________________________
1179 GnuBook.prototype.getPrevLeafs = function(o) {
1180     //TODO: we might have two left or two right leafs in a row (damaged book)
1181     //For now, assume that leafs are contiguous.
1182
1183     //return [this.currentLeafL-2, this.currentLeafL-1];
1184     o.L = this.currentLeafL-2;
1185     o.R = this.currentLeafL-1;
1186 }
1187
1188 // pruneUnusedImgs()
1189 //______________________________________________________________________________
1190 GnuBook.prototype.pruneUnusedImgs = function() {
1191     //console.log('current: ' + this.currentLeafL + ' ' + this.currentLeafR);
1192     for (var key in this.prefetchedImgs) {
1193         //console.log('key is ' + key);
1194         if ((key != this.currentLeafL) && (key != this.currentLeafR)) {
1195             //console.log('removing key '+ key);
1196             $(this.prefetchedImgs[key]).remove();
1197         }
1198         if ((key < this.currentLeafL-4) || (key > this.currentLeafR+4)) {
1199             //console.log('deleting key '+ key);
1200             delete this.prefetchedImgs[key];
1201         }
1202     }
1203 }
1204
1205 // prefetch()
1206 //______________________________________________________________________________
1207 GnuBook.prototype.prefetch = function() {
1208     var lim = this.currentLeafL-4;
1209     var i;
1210     lim = Math.max(lim, 0);
1211     for (i = lim; i < this.currentLeafL; i++) {
1212         this.prefetchImg(i);
1213     }
1214
1215     if (this.numLeafs > (this.currentLeafR+1)) {
1216         lim = Math.min(this.currentLeafR+4, this.numLeafs-1);
1217         for (i=this.currentLeafR+1; i<=lim; i++) {
1218             this.prefetchImg(i);
1219         }
1220     }
1221 }
1222
1223 // getPageWidth2UP()
1224 //______________________________________________________________________________
1225 GnuBook.prototype.getPageWidth2UP = function(index) {
1226     var height  = this.getPageHeight(index);
1227     var width   = this.getPageWidth(index);
1228     return Math.floor(this.twoPageH*width/height);
1229 }
1230
1231 // search()
1232 //______________________________________________________________________________
1233 GnuBook.prototype.search = function(term) {
1234     $('#GnuBookSearchScript').remove();
1235         var script  = document.createElement("script");
1236         script.setAttribute('id', 'GnuBookSearchScript');
1237         script.setAttribute("type", "text/javascript");
1238         script.setAttribute("src", 'http://'+this.server+'/GnuBook/flipbook_search_gb.php?url='+escape(this.bookPath+'/'+this.bookId+'_djvu.xml')+'&term='+term+'&format=XML&callback=gb.GBSearchCallback');
1239         document.getElementsByTagName('head')[0].appendChild(script);
1240 }
1241
1242 // GBSearchCallback()
1243 //______________________________________________________________________________
1244 GnuBook.prototype.GBSearchCallback = function(txt) {
1245     //alert(txt);
1246     if (jQuery.browser.msie) {
1247         var dom=new ActiveXObject("Microsoft.XMLDOM");
1248         dom.async="false";
1249         dom.loadXML(txt);
1250     } else {
1251         var parser = new DOMParser();
1252         var dom = parser.parseFromString(txt, "text/xml");
1253     }
1254
1255     $('#GnuBookSearchResults').empty();
1256     $('#GnuBookSearchResults').append('<ul>');
1257
1258     for (var key in this.searchResults) {
1259         if (null != this.searchResults[key].div) {
1260             $(this.searchResults[key].div).remove();
1261         }
1262         delete this.searchResults[key];
1263     }
1264
1265     var pages = dom.getElementsByTagName('PAGE');
1266     for (var i = 0; i < pages.length; i++){
1267         //console.log(pages[i].getAttribute('file').substr(1) +'-'+ parseInt(pages[i].getAttribute('file').substr(1), 10));
1268
1269
1270         var re = new RegExp (/_(\d{4})/);
1271         var reMatch = re.exec(pages[i].getAttribute('file'));
1272         var leafNum = parseInt(reMatch[1], 10);
1273         //var leafNum = parseInt(pages[i].getAttribute('file').substr(1), 10);
1274
1275         var children = pages[i].childNodes;
1276         var context = '';
1277         for (var j=0; j<children.length; j++) {
1278             //console.log(j + ' - ' + children[j].nodeName);
1279             //console.log(children[j].firstChild.nodeValue);
1280             if ('CONTEXT' == children[j].nodeName) {
1281                 context += children[j].firstChild.nodeValue;
1282             } else if ('WORD' == children[j].nodeName) {
1283                 context += '<b>'+children[j].firstChild.nodeValue+'</b>';
1284
1285                 var index = this.leafNumToIndex(leafNum);
1286                 if (null != index) {
1287                     //coordinates are [left, bottom, right, top, [baseline]]
1288                     //we'll skip baseline for now...
1289                     var coords = children[j].getAttribute('coords').split(',',4);
1290                     if (4 == coords.length) {
1291                         this.searchResults[index] = {'l':coords[0], 'b':coords[1], 'r':coords[2], 't':coords[3], 'div':null};
1292                     }
1293                 }
1294             }
1295         }
1296         //TODO: remove hardcoded instance name
1297         $('#GnuBookSearchResults').append('<li><b><a href="javascript:gb.jumpToIndex('+index+');">Leaf ' + leafNum + '</a></b> - ' + context+'</li>');
1298     }
1299     $('#GnuBookSearchResults').append('</ul>');
1300
1301     this.updateSearchHilites();
1302 }
1303
1304 // updateSearchHilites()
1305 //______________________________________________________________________________
1306 GnuBook.prototype.updateSearchHilites = function() {
1307     if (2 == this.mode) {
1308         this.updateSearchHilites2UP();
1309     } else {
1310         this.updateSearchHilites1UP();
1311     }
1312 }
1313
1314 // showSearchHilites1UP()
1315 //______________________________________________________________________________
1316 GnuBook.prototype.updateSearchHilites1UP = function() {
1317
1318     for (var key in this.searchResults) {
1319
1320         if (-1 != jQuery.inArray(parseInt(key), this.displayedLeafs)) {
1321             var result = this.searchResults[key];
1322             if(null == result.div) {
1323                 result.div = document.createElement('div');
1324                 $(result.div).attr('className', 'GnuBookSearchHilite').appendTo('#pagediv'+key);
1325                 //console.log('appending ' + key);
1326             }
1327             $(result.div).css({
1328                 width:  (result.r-result.l)/this.reduce + 'px',
1329                 height: (result.b-result.t)/this.reduce + 'px',
1330                 left:   (result.l)/this.reduce + 'px',
1331                 top:    (result.t)/this.reduce +'px'
1332             });
1333
1334         } else {
1335             //console.log(key + ' not displayed');
1336             this.searchResults[key].div=null;
1337         }
1338     }
1339 }
1340
1341 // showSearchHilites2UP()
1342 //______________________________________________________________________________
1343 GnuBook.prototype.updateSearchHilites2UP = function() {
1344
1345     var middle = ($('#GBcontainer').width() >> 1);
1346
1347     for (var key in this.searchResults) {
1348         key = parseInt(key, 10);
1349         if (-1 != jQuery.inArray(key, this.displayedLeafs)) {
1350             var result = this.searchResults[key];
1351             if(null == result.div) {
1352                 result.div = document.createElement('div');
1353                 $(result.div).attr('className', 'GnuBookSearchHilite').css('zIndex', 3).appendTo('#GBcontainer');
1354                 //console.log('appending ' + key);
1355             }
1356
1357             var height = this.getPageHeight(key);
1358             var width  = this.getPageWidth(key)
1359             var reduce = this.twoPageH/height;
1360             var scaledW = parseInt(width*reduce);
1361
1362             var gutter = middle+parseInt((2*this.currentLeafL - this.numLeafs)*this.twoPageEdgeW/this.numLeafs/2);
1363
1364             if ('L' == this.getPageSide(key)) {
1365                 var pageL = gutter-scaledW;
1366             } else {
1367                 var pageL = gutter;
1368             }
1369             var pageT  = ($('#GBcontainer').height() - this.twoPageH) >> 1;
1370
1371             $(result.div).css({
1372                 width:  (result.r-result.l)*reduce + 'px',
1373                 height: (result.b-result.t)*reduce + 'px',
1374                 left:   pageL+(result.l)*reduce + 'px',
1375                 top:    pageT+(result.t)*reduce +'px'
1376             });
1377
1378         } else {
1379             //console.log(key + ' not displayed');
1380             if (null != this.searchResults[key].div) {
1381                 //console.log('removing ' + key);
1382                 $(this.searchResults[key].div).remove();
1383             }
1384             this.searchResults[key].div=null;
1385         }
1386     }
1387 }
1388
1389 // removeSearchHilites()
1390 //______________________________________________________________________________
1391 GnuBook.prototype.removeSearchHilites = function() {
1392     for (var key in this.searchResults) {
1393         if (null != this.searchResults[key].div) {
1394             $(this.searchResults[key].div).remove();
1395             this.searchResults[key].div=null;
1396         }
1397     }
1398 }
1399
1400 // showEmbedCode()
1401 //______________________________________________________________________________
1402 GnuBook.prototype.showEmbedCode = function() {
1403     this.autoStop();
1404     var overlay = document.createElement("div");
1405     $(overlay).css({
1406         position: 'absolute',
1407         top:      '20px',
1408         left:     ($('#GBcontainer').width()-400)/2 + 'px',
1409         width:    '400px',
1410         padding:  "20px",
1411         border:   "3px double #999999",
1412         zIndex:   3,
1413         backgroundColor: "#fff"
1414     }).appendTo('#GnuBook');
1415
1416     htmlStr =  '<p style="text-align:center;"><b>Embed Bookreader in your blog!</b></p>';
1417     htmlStr += '<p><b>Note:</b> The bookreader is still in beta testing. URLs may change in the future, breaking embedded books. This feature is just for testing!</b></p>';
1418     htmlStr += '<p>The bookreader uses iframes for embedding. It will not work on web hosts that block iframes. The embed feature has been tested on blogspot.com blogs as well as self-hosted Wordpress blogs. This feature will NOT work on wordpress.com blogs.</p>';
1419     htmlStr += '<p>Embed Code: <input type="text" size="40" value="<iframe src=\'http://www.us.archive.org/GnuBook/GnuBookEmbed.php?id='+this.bookId+'\' width=\'430px\' height=\'430px\'></iframe>"></p>';
1420     htmlStr += '<p style="text-align:center;"><a href="" onclick="$(this.parentNode.parentNode).remove(); return false;">Close popup</a></p>';
1421
1422     overlay.innerHTML = htmlStr;
1423 }
1424
1425 // autoToggle()
1426 //______________________________________________________________________________
1427 GnuBook.prototype.autoToggle = function() {
1428     if (2 != this.mode) {
1429         this.switchMode(2);
1430     }
1431
1432     var self = this;
1433     if (null == this.autoTimer) {
1434         this.flipSpeed = 2000;
1435         this.flipFwdToIndex();
1436
1437         $('#autoImg').removeClass('play').addClass('pause');
1438         this.autoTimer=setInterval(function(){
1439             if (self.animating) {return;}
1440
1441             if (self.currentLeafR >= self.numLeafs-5) {
1442                 self.flipBackToIndex(1);
1443             } else {
1444                 self.flipFwdToIndex();
1445             }
1446         },5000);
1447     } else {
1448         this.autoStop();
1449     }
1450 }
1451
1452 // autoStop()
1453 //______________________________________________________________________________
1454 GnuBook.prototype.autoStop = function() {
1455     if (null != this.autoTimer) {
1456         clearInterval(this.autoTimer);
1457         this.flipSpeed = 'fast';
1458         $('#autoImg').removeClass('pause').addClass('play');
1459         this.autoTimer = null;
1460     }
1461 }