// Tab Menu

var tabmenu={
	disabletablinks: false, //Disable hyperlinks in 1st level tabs with sub contents (true or false)?
	snap2original: [true, 100], //Should tab revert back to default selected when mouse moves out of menu? ([true/false, delay_millisec]

	currentpageurl: window.location.href.replace("http://"+window.location.hostname, "").replace(/^\//, ""), //get current page url (minus hostname)

definemenu:function(tabid, dselected){
	this[tabid+"-menuitems"]=null
	this[tabid+"-dselected"]=-1
	this.addEvent(window, function(){tabmenu.init(tabid, dselected)}, "load")
},

showsubmenu:function(tabid, targetitem){
	var menuitems=this[tabid+"-menuitems"]
	this.clearrevert2default(tabid)
	for (i=0; i<menuitems.length; i++){
		menuitems[i].className=""
		if (typeof menuitems[i].hasSubContent!="undefined")	
			document.getElementById(menuitems[i].getAttribute("rel")).style.display="none"
	}
//	targetitem.className="current"
	onTab(targetitem)
	if (typeof targetitem.hasSubContent!="undefined")
		document.getElementById(targetitem.getAttribute("rel")).style.display="block"
},

isSelected:function(menuurl){
	var menuurl=menuurl.replace("http://"+menuurl.hostname, "").replace(/^\//, "")
	return (tabmenu.currentpageurl==menuurl)
},

isContained:function(m, e){
	var e=window.event || e
	var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
	while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
	if (c==m)
		return true
	else
		return false
},

revert2default:function(outobj, tabid, e){
	if (!tabmenu.isContained(outobj, tabid, e)){
		window["hidetimer_"+tabid]=setTimeout(function(){
			tabmenu.showsubmenu(tabid, tabmenu[tabid+"-dselected"])
		}, tabmenu.snap2original[1])
	}
},

clearrevert2default:function(tabid){
 if (typeof window["hidetimer_"+tabid]!="undefined")
		clearTimeout(window["hidetimer_"+tabid])
},

addEvent:function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)
	var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
	if (target.addEventListener)
		target.addEventListener(tasktype, functionref, false)
	else if (target.attachEvent)
		target.attachEvent(tasktype, functionref)
},

init:function(tabid, dselected){
	var menuitems=document.getElementById(tabid).getElementsByTagName("a")
	this[tabid+"-menuitems"]=menuitems
	for (var x=0; x<menuitems.length; x++){
		if (menuitems[x].getAttribute("rel")){
			this[tabid+"-menuitems"][x].hasSubContent=true
			if (tabmenu.disabletablinks)
				menuitems[x].onclick=function(){return false}
			if (tabmenu.snap2original[0]==true){
				var submenu=document.getElementById(menuitems[x].getAttribute("rel"))
				menuitems[x].onmouseout=function(e){tabmenu.revert2default(submenu, tabid, e)}
				submenu.onmouseover=function(){tabmenu.clearrevert2default(tabid)}
				submenu.onmouseout=function(e){tabmenu.revert2default(this, tabid, e)}
			}
		}
		else //for items without a submenu, add onMouseout effect
			menuitems[x].onmouseout=function(e){this.className=""; if (tabmenu.snap2original[0]==true) tabmenu.revert2default(this, tabid, e)}
		menuitems[x].onmouseover=function(){tabmenu.showsubmenu(tabid, this)}
		if (dselected=="auto" && typeof setalready=="undefined" && this.isSelected(menuitems[x].href)){
			tabmenu.showsubmenu(tabid, menuitems[x])
			this[tabid+"-dselected"]=menuitems[x]
			var setalready=true
		}
		else if (parseInt(dselected)==x){
			tabmenu.showsubmenu(tabid, menuitems[x])
			this[tabid+"-dselected"]=menuitems[x]
		}
	}
}
}
var current
var old

function onTab(current){
	new Effect.Morph(current, { style: 'height:30px;', duration: 0.2 });
	if (old == undefined){
		old = current
	} else if (current == old){
		// do nothing
	} else {
		new Effect.Morph(old, { style: 'height:15px;', duration: 0.2 });
		old = current
	}
}

// launch
tabmenu.definemenu("tabs1", 0) //initialize Tab Menu #1 with 1st tab selected