if (document.images) {

    image1on = new Image();
    image1on.src = "/images/nav_aboutusOn.gif";
    image2on = new Image();
    image2on.src = "/images/nav_servicesOn.gif";
    image3on = new Image();
    image3on.src = "/images/nav_testimonialsOn.gif";
    image4on = new Image();
    image4on.src = "/images/nav_payonlineOn.gif";
    image5on = new Image();
    image5on.src = "/images/nav_recentOn.gif";
    image6on = new Image();
    image6on.src = "/images/nav_contactusOn.gif";
                                  
    image1off = new Image();
    image1off.src = "/images/nav_aboutusOff.gif";
    image2off = new Image();
    image2off.src = "/images/nav_servicesOff.gif";
    image3off = new Image();
    image3off.src = "/images/nav_testimonialsOff.gif";
    image4off = new Image();
    image4off.src = "/images/nav_payonlineOff.gif";
    image5off = new Image();
    image5off.src = "/images/nav_recentOff.gif";
    image6off = new Image();
    image6off.src = "/images/nav_contactusOff.gif";                  
}

function changeImages(){
    if (document.images){
        for (var i=0; i<changeImages.arguments.length; i+=2){
            document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
        }
    }
}