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) {
		home_over = newImage("pix/home-over.gif");
		report_over = newImage("pix/report-over.gif");
		download_over = newImage("pix/download-over.gif");
		member_over = newImage("pix/member-over.gif");
		library_over = newImage("pix/library-over.gif");
		papers_over = newImage("pix/papers-over.gif");
		websites_over = newImage("pix/websites-over.gif");
		sponsor_over = newImage("pix/sponsor-over.gif");
		link_over = newImage("pix/link-over.gif");
		contact_over = newImage("pix/contact-over.gif");
		preloadFlag = true;
	}
}