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_history_over = newImage("UIimages/History_over.gif");		nav_services_over = newImage("UIimages/Services_over.gif");		nav_news_over = newImage("UIimages/News_over.gif");		nav_portfolio_over = newImage("UIimages/Portfolio_over.gif");		nav_careers_over = newImage("UIimages/Careers_over.gif");		nav_contact_over = newImage("UIimages/Contact_over.gif");		nav_home_over = newImage("UIimages/Home_over.gif");				bottom_nav_projects_over = newImage("images/index_bottom_nav-projects_over.gif");		bottom_nav_employee_over = newImage("images/index_bottom_nav-employee_over.gif");		bottom_nav_location_over = newImage("images/index_bottom_nav-location_over.gif");				sub_nav_gis = newImage("images/sub_nav_gis.gif");		sub_nav_planning = newImage("images/sub_nav_planning.gif");		sub_nav_sitedev = newImage("images/sub_nav_sitedev.gif");		sub_nav_structural = newImage("images/sub_nav_structural.gif");		sub_nav_surfacewater = newImage("images/sub_nav_surfacewater.gif");		sub_nav_surveying = newImage("images/sub_nav_surveying.gif");		sub_nav_trans = newImage("images/sub_nav_trans.gif");		sub_nav_utilities = newImage("images/sub_nav_utilities.gif");				sub_nav_careers = newImage("images/sub_nav_careers.gif");		sub_nav_job_opportunities = newImage("images/sub_nav_job_opportunities.gif");		sub_nav_submit_resume = newImage("images/sub_nav_submit_resume.gif");		sub_nav_training = newImage("images/sub_nav_training.gif");		sub_nav_life = newImage("images/sub_nav_life.gif");				sub_nav_featured = newImage("images/sub_nav_news.gif");		sub_nav_whitepapers = newImage("images/sub_nav_whitepapers.gif");		sub_nav_newsletters = newImage("images/sub_nav_newsletters.gif");		sub_nav_whats_new = newImage("images/sub_nav_whats_new.gif");		preloadFlag = true;	}}