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_links_nav_home_over = newImage("/files/nav_links-nav_home_over.gif");
		nav_links_nav_about_over = newImage("/files/nav_links-nav_about_over.gif");
		nav_links_nav_services_over = newImage("/files/nav_links-nav_services_over.gif");
		nav_links_nav_portfolio_over = newImage("/files/nav_links-nav_portfolio_over.gif");
		nav_links_nav_casestudies_over = newImage("/files/nav_links-nav_casestudies_over.gif");
		nav_links_nav_clientlist_over = newImage("/files/nav_links-nav_blog_over.gif");
		nav_links_nav_quoterequest_over = newImage("/files/nav_links-nav_quoterequest_over.gif");
		nav_links_nav_contact_over = newImage("/files/nav_links-nav_contact_over.gif");
		preloadFlag = true;
	}
}