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";
	
	retailOn = new Image();   retailOn.src = "images/nav_main_retail2.gif";
	retailOff = new Image();   retailOff.src = "images/nav_main_retail1.gif";

	insuranceOn = new Image();   insuranceOn.src = "images/nav_main_insurance2.gif";
	insuranceOff = new Image();   insuranceOff.src = "images/nav_main_insurance1.gif";

	publicOn = new Image();   publicOn.src = "images/nav_main_publicsector2.gif";
	publicOff = new Image();   publicOff.src = "images/nav_main_publicsector1.gif";

	manufacturingOn = new Image();   manufacturingOn.src = "images/nav_main_manufacturing2.gif";
	manufacturingOff = new Image();   manufacturingOff.src = "images/nav_main_manufacturing1.gif";

	warehousingOn = new Image();   warehousingOn.src = "images/nav_main_datawarehousing2.gif";
	warehousingOff = new Image();   warehousingOff.src = "images/nav_main_datawarehousing1.gif";

	analyticsOn = new Image();   analyticsOn.src = "images/nav_main_advanalytics2.gif";
	analyticsOff = new Image();   analyticsOff.src = "images/nav_main_advanalytics1.gif";

	applianceOn = new Image();   applianceOn.src = "images/nav_main_appliance2.gif";
	applianceOff = new Image();   applianceOff.src = "images/nav_main_appliance1.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";
            
	sweeneyOn = new Image();   sweeneyOn.src = "images/nav_sub_who_terrysweeney2.gif";
	sweeneyOff = new Image();   sweeneyOff.src = "images/nav_sub_who_terrysweeney1.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");        
		}
	}
	
}