function isNS()
{
    return ((document.layers)?true:false);
}

function isN6()
{
    return (document.getElementById&&!document.all);
}

function isMac()
{
    return (navigator.platform.indexOf("Mac")!=-1);
}

function dGet(id,pid)
{
    if (isNS())
    {
        if (pid) return "document." + pid + ".document." +id;
        else return "document.layers['" + id + "']";
    }
    else
    {
        if (isN6()) return "document.getElementById('"+id+"')";
        else return "document.all['" + id + "']";
    }
}

function dShw(id,pid,bl)
{
    eval(dGet(id,pid) + ((!isNS())? ".style" : "") + ".visibility = " + ((bl)? "'visible'" : "'hidden'"));
}

function tancar_menu(id_menu, img_titol)
{
    eval(dGet("m"+id_menu,null) + ".style.display = 'none'");
}

function obrir_menu(id_menu, img_titol)
{
    eval(dGet("m"+id_menu,null) + ".style.display = 'block'");
}

function actualitzar_menu(id_menu)
{
    if (eval(dGet("m"+id_menu, null) + ".style.display") == "")
    {
        eval(dGet("m"+id_menu,null) + ".style.display = 'none'");
    }
    else
    {
        if (eval(dGet("m"+id_menu, null) + ".style.display") == "none")
        {
            eval(dGet("m"+id_menu,null) + ".style.display = 'block'");
        }
        else
        {
            eval(dGet("m"+id_menu,null) + ".style.display = 'none'");
        }
    }
}

function resetMenus(id_menu)
{
 for (i=1; i<=7; i++)
 {
  tancar_menu(i);
 }
 //tancar_menu(6);
 if (id_menu > 0) { obrir_menu(id_menu); };
}