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

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

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++) {
    mastertabvar[tabid][mastertabvar[tabid].length] = menuitems[i].getAttribute("rel");  // store ids of submenus of tab menu
    menuitems[i].onmouseover = function() {
      showsubmenu(this.getAttribute("rel"))
    }
    if (menuitems[i].className.search("active") != -1) {
      rel = menuitems[i].getAttribute("rel");
      if (rel) {
        showsubmenu(rel);
      }
    }
  }
}