if (document.images) {            // Active Images
            img1over = new Image();      
            img1over.src = "/images/menu_home_over.gif"; 
            img2over = new Image(); 
            img2over.src = "/images/menu_services_over.gif";  
            img3over = new Image();
            img3over.src = "/images/menu_tzabia_over.gif";
            img4over = new Image();
            img4over.src = "/images/menu_clients_over.gif";
            img6over = new Image();
            img6over.src = "/images/menu_contact_over.gif";
         
            img1off = new Image();      
            img1off.src = "/images/menu_home.gif"; 
            img2off = new Image(); 
            img2off.src = "/images/menu_services.gif";  
            img3off = new Image();
            img3off.src = "/images/menu_tzabia.gif";
            img4off = new Image();
            img4off.src = "/images/menu_clients.gif";
            img6off = new Image();
            img6off.src = "/images/menu_contact.gif";
        }


function imgOver(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "over.src");
        }
}
         
// function to 'deactivate' images.
         
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}