Kode til styring af placering af menu i Firefox

Jeg har en menu, som vises fint i IE6+7, men som i Firefox rykker ca. 26 px. op. http://www.quatre.dk/index.htm
Jeg har en .js fil, hvor det hele styres.
Kan nogen hjælpe med at putte noget kode ind, som styrer placeringen af menuen i Firefox?

Koden:
--------------------------------------------------------
//---- Set this variable only! ----
var buildDir = "http://www.quatre.dk/includes/";
//---------------------------------

var ie4 = false, ie5_mac = false, ie55 = false;
var nn4 = false, dom = false, opera = false, safari = false;
var agent = navigator.userAgent.toLowerCase();

if (agent.indexOf("opera") != -1)
    opera = true;
else if (agent.indexOf("safari") != -1)
    safari = true;
else if (document.all)
{
    var version = parseFloat(agent.substr(agent.indexOf("msie")+5, 3));
    if (agent.indexOf("mac") != -1 && version >= 5)
        ie5_mac = true;
    else
    {
        if (version >= 5.5)
            ie55 = true;
        else if (version >= 4)
            ie4 = true;
    }
}
//else if (document.layers)
else if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4 &&
    parseInt(navigator.appVersion) < 5)
    nn4 = true;
else if (document.getElementById)
    dom = true;

var blank = new Image();
blank.src = buildDir + "blank.gif";

if (ie4)
    document.write('<script type="text/javascript" src="' + buildDir + 'ie4-build.js"></script>');
else if (ie5_mac)
    document.write('<script type="text/javascript" src="' + buildDir + 'ie5m-build.js"></script>');
else if (ie55)
    document.write('<script type="text/javascript" src="' + buildDir + 'ie55-build.js"></script>');
else if (nn4)
    document.write('<script type="text/javascript" src="' + buildDir + 'ns4-build.js"></script>');
else if (dom)
    document.write('<script type="text/javascript" src="' + buildDir + 'dom-build.js"></script>');
else if (opera)
    document.write('<script type="text/javascript" src="' + buildDir + 'op7-build.js"></script>');
else if (safari)
    document.write('<script type="text/javascript" src="' + buildDir + 'saf-build.js"></script>');
else
{
    alert("Your browser doesn't support this script.");
    location.href = buildDir + "upgrade.html";
    document.write('<script type="text/javascript" src="' + buildDir + 'no-build.js"></script>');
}
-----------------------------------------------------

Håber I kan hjælpe?

My Charlot