1 // usage: onClick="return do_checkbox('name',[1|0|-1];")
2 // 1 = select all, 0 = select none, -1 = toggle selection
3 function do_checkbox(name,what) {
4 var boxes = document.getElementsByName(name);
5 for (var i = 0; boxes && i < boxes.length; i++) {
7 case 1: boxes[i].checked = true; break;
8 case 0: boxes[i].checked = false; break;
9 case -1: boxes[i].checked = !boxes[i].checked; break;
12 return false; // don't scroll