var firstRow = rowsToDisplay[0];
var lastRow = rowsToDisplay[rowsToDisplay.length-1];
for (i=1; i<this.thumbRowBuffer+1; i++) {
var firstRow = rowsToDisplay[0];
var lastRow = rowsToDisplay[rowsToDisplay.length-1];
for (i=1; i<this.thumbRowBuffer+1; i++) {