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) {
		bannerover = newImage("images/nav/bannerover.gif");
		bannerover005 = newImage("images/nav/bannerover-05.gif");
		bannerover006 = newImage("images/nav/bannerover-06.gif");
		bannerover007 = newImage("images/nav/bannerover-07.gif");
		bannerover008 = newImage("images/nav/bannerover-08.gif");
		bannerover009 = newImage("images/nav/bannerover-09.gif");
		bannerover010 = newImage("images/nav/bannerover-10.gif");
		bannerover011 = newImage("images/nav/bannerover-11.gif");
		homeover = newImage("images/nav/homeover.gif");
		corpover = newImage("images/nav/corpover.gif");
		solover = newImage("images/nav/solover.gif");
		sysover = newImage("images/nav/sysover.gif");
		marover = newImage("images/nav/marover.gif");
		consultover = newImage("images/nav/consultover.gif");
		newsover = newImage("images/nav/newsover.gif");
		servover = newImage("images/nav/servover.gif");
		contactover = newImage("images/nav/contactover.gif");
		preloadFlag = true;
	}
}