<!-- hide script from old browsers
//detect browser:
browserName = navigator.appName; 
         browserVer = parseInt(navigator.appVersion);
             if (browserName == "Netscape" && browserVer >= 3) browserVer = "1";
                 else if (browserName == "Microsoft Internet Explorer" && browserVer == 4) browserVer = "1";
             else browserVer = "2";

//preload images:
if (browserVer == 1) {
        a1 = new Image(75,29);
        a1.src = "imas/me_catalogo.gif";      
        a2 = new Image(75,29);
        a2.src = "imas/me_hcatalogo.gif";
        b1 = new Image(75,29);
        b1.src = "imas/me_nosotros.gif";      
        b2 = new Image(75,29);
        b2.src = "imas/me_hnosotros.gif";
        c1 = new Image(93,29);
        c1.src = "imas/me_llegar.gif";      
        c2 = new Image(93,29);
        c2.src = "imas/me_hllegar.gif";
        d1 = new Image(73,29);
        d1.src = "imas/me_contacto.gif";      
        d2 = new Image(73,29);
        d2.src = "imas/me_hcontacto.gif";

}

//image swapping function:
function menuActivo(imgDocID, imgObjName, comment, path) {
if (browserVer == 1) {
        document.images[imgDocID].src = eval(path + imgObjName + ".src");
        window.status = comment; return true;
}}
//end hiding -->