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 preload() {
	if (document.images) {
		wdc_over = newImage("images/wdc_over.gif");
		winvest_over = newImage("images/winvest_over.gif");
		works_over = newImage("images/works_over.gif");
		yobuf_over = newImage("images/yobuf_over.gif");
		ecc_over = newImage("images/ecc_over.gif");
		betc_over = newImage("images/betc_over.gif");
		preloadFlag = true;
	}
}