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

var lastSelectedTab=undefined;

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++) {
			menuitems[i].setAttribute("rev", tabid); //associate this submenu with main tab
			if (menuitems[i].getAttribute("rel")) {
				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"));
					lastSelectedTab = menuitems[i];
					}
				menuitems[i].getElementsByTagName("a")[0].onmouseover = function() {
					showsubmenu(this.parentNode.getAttribute("rev"), this.parentNode.getAttribute("rel"));
					lastSelectedTab.className = "undefined";
					this.parentNode.className = "selected";
					lastSelectedTab = this.parentNode;
					}
				}
			else {
				menuitems[i].getElementsByTagName("a")[0].onmouseover = function() {
					showsubmenu(this.parentNode.getAttribute("rev"), this.parentNode.getAttribute("rel"));
					}
				}
			}
		}