var originalSource;
function showHoverImage(a) {
	if (a.attributes['image'].value != "null") {
		var theImage = document.getElementById('rolloverImage');
		!originalSource ? originalSource = theImage.src : null;
		theImage.src = a.attributes['image'].value;
	}
}
function showStandardImage() {
	var theImage = document.getElementById('rolloverImage');
	theImage.src = originalSource;
}