var mastertabvar = new Object();
mastertabvar.baseopacity = 0;
mastertabvar.browserdetect = "";

function showsubmenu(masterid, id)
{
  if (typeof highlighting != "undefined")
    clearInterval(highlighting);
  submenuobject = document.getElementById(id);
  mastertabvar.browserdetect = submenuobject.filters ? "ie" : typeof submenuobject.style.MozOpacity == "string" ? "mozilla" : "";
  hidesubmenus(mastertabvar[masterid]);
  submenuobject.style.display = "block";
  instantset(mastertabvar.baseopacity);
  highlighting = setInterval("gradualfade(submenuobject)", 50);
}

function hidesubmenus(submenuarray)
{
  for (var i = 0; i < submenuarray.length; i++)
    document.getElementById(submenuarray[i]).style.display = "none";
}

function instantset(degree)
{
  if (mastertabvar.browserdetect == "mozilla")
    submenuobject.style.MozOpacity = degree / 100;
  else if (mastertabvar.browserdetect == "ie")
    submenuobject.filters.alpha.opacity = degree;
}

function gradualfade(cur2)
{
  if (mastertabvar.browserdetect == "mozilla" && cur2.style.MozOpacity < 1)
    cur2.style.MozOpacity = Math.min(parseFloat(cur2.style.MozOpacity) + 0.1, 0.99);
  else if (mastertabvar.browserdetect == "ie" && cur2.filters.alpha.opacity < 100)
    cur2.filters.alpha.opacity += 10;
  else if (typeof highlighting != "undefined") //fading animation over
    clearInterval(highlighting)
}

function initalizetab(tabid)
{
  mastertabvar[tabid] = new Array();
  var menuitems = document.getElementById(tabid).getElementsByTagName("li");
  for (var i = 0; i < menuitems.length; i++)
  {
    if (menuitems[i].getAttribute("rel"))
    {
      menuitems[i].setAttribute("rev", tabid); //associate this submenu with main tab
      mastertabvar[tabid][mastertabvar[tabid].length] = menuitems[i].getAttribute("rel"); //store ids of submenus of tab menu
      if (menuitems[i].className == "selected")
        showsubmenu(tabid, menuitems[i].getAttribute("rel"));
      menuitems[i].getElementsByTagName("a")[0].onmouseover = function ()
      {
        showsubmenu(this.parentNode.getAttribute("rev"), this.parentNode.getAttribute("rel"));
      }
    }
  }
}