var DHTML = (document.getElementById || document.all || document.layers);

function getLayer(name)
{
    if (!DHTML) return;
	if (document.layers)
    {
	return document.layers[name];
    }
    else if (document.all)
    {
	return document.all[name].style;
    }
    else if (document.getElementById)
    {
	return document.getElementById(name).style;
    }
    else return false;
}

function MenuOn(idx)
{
    var normal = getLayer("menu"+idx);
    var rollover = getLayer("menu"+idx+"_on");
    if (normal && rollover)
    {
        normal.visibility = "hidden";
        rollover.visibility = "visible";
    }
    return true;
}

function MenuOff(idx)
{
    var normal = getLayer("menu"+idx);
    var rollover = getLayer("menu"+idx+"_on");
    if (normal && rollover)
    {
        normal.visibility = "visible";
        rollover.visibility = "hidden";
    }
    return true;
}

function Onglet(idx)
{
    var onglet1 = getLayer("onglet1");
    var onglet2 = getLayer("onglet2");
    var onglet3 = getLayer("onglet3");
    var onglet = getLayer("onglet"+idx);
    
    if (onglet1 && onglet2 && onglet3 && onglet)
    {
        onglet1.visibility = "hidden";
        onglet2.visibility = "hidden";
        onglet3.visibility = "hidden";
        onglet.visibility = "visible";
    }
    return true;
}

function Onglet4(idx)
{
    var onglet1 = getLayer("onglet1");
    var onglet2 = getLayer("onglet2");
    var onglet3 = getLayer("onglet3");
    var onglet4 = getLayer("onglet4");
    var onglet = getLayer("onglet"+idx);
    
    if (onglet1 && onglet2 && onglet3 && onglet)
    {
        onglet1.visibility = "hidden";
        onglet2.visibility = "hidden";
        onglet3.visibility = "hidden";
        onglet4.visibility = "hidden";
        onglet.visibility = "visible";
    }
    return true;
}