function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		paintings_over = newImage("images/paintings-over.gif");
		print_making_over = newImage("images/print_making-over.gif");
		ceramics_pottery_over = newImage("images/ceramics_pottery-over.gif");
		ceramics_handbuilding_over = newImage("images/ceramics_handbuilding-over.gif");
		sculpture_over = newImage("images/sculpture-over.gif");
		multimedia_work_over = newImage("images/multimedia_work-over.gif");
		sketches_over = newImage("images/sketches-over.gif");
		digital_work_over = newImage("images/digital_work-over.gif");
		advanced_doodles_over = newImage("images/advanced_doodles-over.gif");
		photography_over = newImage("images/photography-over.gif");
		preloadFlag = true;
	}
}