function rollover(img_name, img_src)
        {
            document[img_name].src = img_src;
            document.getElementById("link").style.textDecoration="underline";
        }
        
        function rollout(img_name, img_src)
        {
            document[img_name].src = img_src;
        
            document.getElementById("link").style.textDecoration="none";
        }