// preload images
			if (document.images) {
				  homeon = new Image();
				  homeon.src = "images/home.roll.gif";
				  homeoff = new Image();
				  homeoff.src = "images/home.off.gif";

				  manuon = new Image();
				  manuon.src = "images/manu.roll.gif";
				  manuoff = new Image();
				  manuoff.src = "images/manu.off.gif";
				  
				  servon = new Image();
				  servon.src = "images/serv.roll.gif";
				  servoff = new Image();
				  servoff.src = "images/serv.off.gif";

				  abouton = new Image();
				  abouton.src = "images/about.roll.gif";
				  aboutoff = new Image();
				  aboutoff.src = "images/about.off.gif";
				
				  newson = new Image();
				  newson.src = "images/news.roll.gif";
				  newsoff = new Image();
				  newsoff.src = "images/news.off.gif";
				  
				  contacton = new Image();
				  contacton.src = "images/contact.roll.gif";
				  contactoff = new Image();
				  contactoff.src = "images/contact.off.gif";

				  
				}

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

						}
				}

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