if (document.images) 
{
	
	img1on = new Image(); img1on.src = "images/nav_about_on.gif";
	img2on = new Image(); img2on.src = "images/nav_offer_on.gif";
	img3on = new Image(); img3on.src = "images/nav_visit_on.gif";
	

	img1off = new Image(); img1off.src = "images/nav_about_off.gif";
	img2off = new Image(); img2off.src = "images/nav_offer_off.gif";
	img3off = new Image(); img3off.src = "images/nav_visit_off.gif";
	
	

	var imgNow;
}

function imgOn(imgName) {
 if (document.images) {
 document[imgName].src = eval(imgName + "on.src"); }
 }
 function imgOff(imgName) {
 if (document.images) {
	if (imgName != imgNow)
	 document[imgName].src = eval(imgName + "off.src"); } }