//top nav
var active;
var activeMenu;
active = function(id) {
	var nav = document.getElementById(id);
	if (!nav){
		return;
	}
	var e = nav.getElementsByTagName("LI");
	for (var i=0; i<e.length; i++) {
		e[i].onmouseover = function() {
		    if (activeMenu){
				activeMenu.onmouseout();
			}
		    activeMenu = this;
			this.className += " active";
		}
		e[i].onmouseout = function() {
			this.className = this.className.replace(/active/g, '');
		}
	}
	navFocus(id,true);
};

//focus nav on tab
var navFocus;
navFocus = function(id,mouseOverMenu){
	var subnav = document.getElementById(id);
	if (!subnav){
		return;
	}  
	var list = subnav.getElementsByTagName("A");
	for (var i = 0; i < list.length; i++){
		var e = list[i];
		if (e.parentNode.parentNode.id == id){
			if (mouseOverMenu){
				e.onfocus = function(){
					this.parentNode.onmouseover();
				}
			} else {
				e.onfocus = function(){
					this.parentNode.onclick();
				}
			}
 		}
	}
	if (list.length == 0){
		return;
	}
	var lastSub = list[list.length-1];
	if (lastSub.parentNode.parentNode.id == id){
		return;
	}
	lastSub.onblur = function(){
    	this.parentNode.parentNode.parentNode.onmouseout();
	}
};

active('nav');