var mastertabvar = new Object()

function showsubmenu(masterid, id) {
  submenuobject = document.getElementById(id)
  hidesubmenus(mastertabvar[masterid])
  submenuobject.style.display = "block"
  setselected(masterid, id);
}

function setselected(masterid, id) {
  var menuitems = document.getElementById(masterid).getElementsByTagName("li")
  for (var i = 0; i < menuitems.length; i++) {
    if (menuitems[i].getAttribute("rel")) {
      submenu = menuitems[i].getAttribute("rel") //store ids of submenus of tab menu
      if(submenu == id)
        menuitems[i].className = "selected";
      else
        menuitems[i].className = "";
    }
  }
}

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

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"))
      }
    }
  }
}