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) {
		about_us_over = newImage("/images/about_us-over.gif");
		products_over = newImage("/images/products-over.gif");
		technologies_over = newImage("/images/technologies-over.gif");
		trail_over = newImage("/images/trail-over.gif");
		investor_over = newImage("/images/investor-over.gif");
		announcements_over = newImage("/images/announcements-over.gif");
		preloadFlag = true;
	}
}