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 = "../GIF/" + thisImage.id + "-over.gif";
	/*--the above line navigates to the proper directory and appends the img id to assign a new file name for the rollover image--*/
	thisImage.onmouseover = rollOver;
}

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

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