browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )))

if (browser)

{

Img1off = new Image(55, 23);
Img1off.src = "../images/tb_hom1.gif";
Img1on = new Image(55, 23);
Img1on.src = "../images/tb_hom2.gif";

Img2off = new Image(77, 23);
Img2off.src = "../images/tb_abo1.gif";
Img2on = new Image(77, 23);
Img2on.src = "../images/tb_abo2.gif";

Img3off = new Image(77, 23);
Img3off.src = "../images/tb_ser1.gif";
Img3on = new Image(77, 23);
Img3on.src = "../images/tb_ser2.gif";

Img4off = new Image(81, 23);
Img4off.src = "../images/tb_por1.gif";
Img4on = new Image(81, 23);
Img4on.src = "../images/tb_por2.gif";

Img5off = new Image(93, 23);
Img5off.src = "../images/tb_con1.gif";
Img5on = new Image(93, 23);
Img5on.src = "../images/tb_con2.gif";

}

function loadimage(imageName, imgObjName)
{
    if (browser) 
    {
        document.images[imageName].src = eval(imgObjName + ".src");
        return true;
    }
}