if (document.images) {            // Active Images

            img1dn = new Image(); 
            img1dn.src = "../images/subnav/profile_dn.gif"; 
            img2dn = new Image();      
            img2dn.src = "../images/subnav/services_dn.gif"; 
            img3dn = new Image(); 
            img3dn.src = "../images/subnav/contact_dn.gif";  

            img1up = new Image(); 
            img1up.src = "../images/subnav/profile_up.gif"; 
            img2up = new Image(); 
            img2up.src = "../images/subnav/services_up.gif"; 
            img3up = new Image();          
            img3up.src = "../images/subnav/contact_up.gif";                     

        }

// Function to 'activate' images.
function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "dn.src");
        }
}

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