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) {
		aboutus_over = newImage("navimages/aboutus-over.gif");
		wedefinewhat_over = newImage("navimages/wedefinewhat-over.gif");
		wedeterminehow_over = newImage("navimages/wedeterminehow-over.gif");
		weexecute_over = newImage("navimages/weexecute-over.gif");
		brainbased_over = newImage("navimages/brainbased-over.gif");
		brickbased_over = newImage("navimages/brickbased-over.gif");
		projects_over = newImage("navimages/projects-over.gif");
		contactus_over = newImage("navimages/contactus-over.gif");
		preloadFlag = true;
	}
}