window.onload = rolloverInit;
//
//
function rolloverInit () {
	for (var i=0; i<document.images.length;i++){
		if (document.images[i].parentNode.tagName =="A") {
			setupRollover (document.images[i]);
		}
	}
}
function setupRollover (thisImage) {
	thisImage.outImage = new Image();
	thisImage.outImage.src = thisImage.src;
	thisImage.onmouseout = rollOut;
	
	thisImage.overImage = new Image();
	thisImage.overImage.src = "images/" + thisImage.id + "_over.jpg";
	thisImage.onmouseover = rollOver;
	
}

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

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