addOnload(rolloverInit);	// refers to onload-handler.js

function rolloverInit() {
	for (var i=0; i<document.images.length; i++) {
		if (document.images[i].className.indexOf('rollover') > -1) {
			setupRollover(document.images[i]);
		}
	}
}

function setupRollover(thisImage) {
	thisImage.outImage = new Image();
	thisImage.outImage.src = thisImage.src;
	thisImage.onmouseout = rollOut;

	var p =  thisImage.src.lastIndexOf('.');
	thisImage.overImage = new Image();
	thisImage.overImage.src = thisImage.src.slice(0,p) + '_rollover' + thisImage.src.slice(p);
	thisImage.onmouseover = rollOver;	
}

function rollOver() {
	this.src = this.overImage.src;
}

function rollOut() {
	this.src = this.outImage.src;
}