var preloadFlag = false;

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];
		}
	}
}

function preloadImages() {
	if (document.images) {
	header_rollover = newImage("/header_rollover.jpg");
	preloadFlag = true;
	}
}