if (document.images) {
	
	// main navigation
	whoOn = new Image();   whoOn.src = "images/nav_main_who2.gif";
	whoOff = new Image();   whoOff.src = "images/nav_main_who1.gif";

	whatOn = new Image();   whatOn.src = "images/nav_main_what2.gif";
	whatOff = new Image();   whatOff.src = "images/nav_main_what1.gif";
            
	whereOn = new Image();   whereOn.src = "images/nav_main_where2.gif";
	whereOff = new Image();   whereOff.src = "images/nav_main_where1.gif";

	whenOn = new Image();   whenOn.src = "images/nav_main_when2.gif";
	whenOff = new Image();   whenOff.src = "images/nav_main_when1.gif";
	
	howOn = new Image();   howOn.src = "images/nav_main_how2.gif";
	howOff = new Image();   howOff.src = "images/nav_main_how1.gif";
	
	whyOn = new Image();   whyOn.src = "images/nav_main_why2.gif";
	whyOff = new Image();   whyOff.src = "images/nav_main_why1.gif";
	
	homeOn = new Image();   homeOn.src = "images/nav_main_home2.gif";
	homeOff = new Image();   homeOff.src = "images/nav_main_home1.gif";
	
	// sub navigation
	// who
	saarenOn = new Image();   saarenOn.src = "images/nav_sub_who_saaren2.gif";
	saarenOff = new Image();   saarenOff.src = "images/nav_sub_who_saaren1.gif";

	walkerOn = new Image();   walkerOn.src = "images/nav_sub_who_walker2.gif";
	walkerOff = new Image();   walkerOff.src = "images/nav_sub_who_walker1.gif";
            
	allanhoOn = new Image();   allanhoOn.src = "images/nav_sub_who_allanho2.gif";
	allanhoOff = new Image();   allanhoOff.src = "images/nav_sub_who_allanho1.gif";

	lloydOn = new Image();   lloydOn.src = "images/nav_sub_who_timlloyd2.gif";
	lloydOff = new Image();   lloydOff.src = "images/nav_sub_who_timlloyd1.gif";

	sweeneyOn = new Image();   sweeneyOn.src = "images/nav_sub_who_terrysweeney2.gif";
	sweeneyOff = new Image();   sweeneyOff.src = "images/nav_sub_who_terrysweeney1.gif";



	// why
	caseOn = new Image();   caseOn.src = "images/nav_sub_why_case2.gif";
	caseOff = new Image();   caseOff.src = "images/nav_sub_why_case1.gif";

	clientsOn = new Image();   clientsOn.src = "images/nav_sub_why_clients2.gif";
	clientsOff = new Image();   clientsOff.src = "images/nav_sub_why_clients1.gif";
            
	partnersOn = new Image();   partnersOn.src = "images/nav_sub_why_partners2.gif";
	partnersOff = new Image();   partnersOff.src = "images/nav_sub_why_partners1.gif";

	function imgOn(imgName) {
		if (document.images) {
			document.images[imgName].src = eval(imgName + "On.src");       
		}
	}

	function imgOff(imgName) {
		if (document.images) {
			document.images[imgName].src = eval(imgName + "Off.src");        
		}
	}