if(document.images)  {

homeoff = new Image();
homeoff.src = "images/homeoff.gif";
homeon = new Image();
homeon.src = "images/homeon.gif";

serviceoff = new Image();
serviceoff.src = "images/serviceoff.gif";
serviceon = new Image();
serviceon.src = "images/serviceon.gif";

installationoff = new Image();
installationoff.src = "images/installationoff.gif";
installationon = new Image();
installationon.src = "images/installationon.gif";

testimonialsoff = new Image();
testimonialsoff.src = "images/testimonialsoff.gif";
testimonialson = new Image();
testimonialson.src = "images/testimonialson.gif";

linksoff = new Image();
linksoff.src = "images/linksoff.gif";
linkson = new Image();
linkson.src = "images/linkson.gif";

aboutusoff = new Image();
aboutusoff.src = "images/aboutusoff.gif";
aboutuson = new Image();
aboutuson.src = "images/aboutuson.gif";

contactusoff = new Image();
contactusoff.src = "images/contactusoff.gif";
contactuson = new Image();
contactuson.src = "images/contactuson.gif";

} 

function onoff(imgName,state) {
        if(document.images) {               
		document.images[imgName].src = eval(imgName+state+".src");
        }
}