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) {
		id01_over = newImage("images/home/id01_over.gif");
		id02_over = newImage("images/home/id02_over.gif");
		id03_over = newImage("images/home/id03_over.gif");
		id04_over = newImage("images/home/id04_over.gif");
		ourcredo_over = newImage("images/home/ourcredo_over.gif");
		aboutus_over = newImage("images/home/aboutus_over.gif");
		portfolio_over = newImage("images/home/portfolio_over.gif");
		contactus_over = newImage("images/home/contactus_over.gif");
		circle01_over = newImage("images/home/circle01_over.gif");
		circle02_over = newImage("images/home/circle02_over.gif");
		circle03_over = newImage("images/home/circle03_over.gif");
		circle04_over = newImage("images/home/circle04_over.gif");
		preloadFlag = true;
	}
}