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) {
		nav_company_over = newImage("images/nav_company_over.gif");
		nav_solutions_over = newImage("images/nav_solutions_over.gif");
		nav_customers_over = newImage("images/nav_customers_over.gif");
		nav_partners_over = newImage("images/nav_partners_over.gif");
		nav_services_over = newImage("images/nav_services_over.gif");
		
		nav_login_over = newImage("images/nav_login_over.gif");
		nav_careers_over = newImage("images/nav_careers_over.gif");
		nav_news_over = newImage("images/nav_news_over.gif");
		nav_contact_over = newImage("images/nav_contact_over.gif");
		preloadFlag = true;
	}
}