selected_page = null;
previous_page = 1;
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3 || browserVer >= 4) 
    version = "n3";
else version = "n2";

if (version == "n3") {
    menu1on = new Image();
    menu1on.src = "/skin/menu1on.gif";
    menu1off = new Image();
    menu1off.src = "/skin/menu1off.gif";
    menu2on = new Image();
    menu2on.src = "/skin/menu2on.gif";
    menu2off = new Image();
    menu2off.src = "/skin/menu2off.gif";
    menu3on = new Image();
    menu3on.src = "/skin/menu3on.gif";
    menu3off = new Image();
    menu3off.src = "/skin/menu3off.gif";
    menu4on = new Image();
    menu4on.src = "/skin/menu4on.gif";
    menu4off = new Image();
    menu4off.src = "/skin/menu4off.gif";
    menu5on = new Image();
    menu5on.src = "/skin/menu5on.gif";
    menu5off = new Image();
    menu5off.src = "/skin/menu5off.gif";
    menu6on = new Image();
    menu6on.src = "/skin/menu6on.gif";
    menu6off = new Image();
    menu6off.src = "/skin/menu6off.gif";
    menu7on = new Image();
    menu7on.src = "/skin/menu7on.gif";
    menu7off = new Image();
    menu7off.src = "/skin/menu7off.gif";
    menu8on = new Image();
    menu8on.src = "/skin/menu8on.gif";
    menu8off = new Image();
    menu8off.src = "/skin/menu8off.gif";
}

function img_act(imgNr, track) {
    if (version == "n3" && selected_page != track) {
        imgName = "menu" + imgNr;
        imgOn = eval(imgName + "on.src");
        document[imgName].src = imgOn;
    }
}

function img_inact(imgNr, track) {
    if (version == "n3" && selected_page != track) {
        imgName = "menu" + imgNr;
        imgOff = eval(imgName + "off.src");
        document[imgName].src = imgOff;
    }
}

function img_restore (imgNr) {
    if (selected_page != null) {
        previous_page = selected_page;
    }
    selected_page = imgNr;
    if (previous_page != null) {
        img_inact(previous_page, previous_page);
    }
}