//Mostra submenus no IE
function menuheader() {
	if(document.getElementById("navigation")){
	   var navItems = document.getElementById("navigation").getElementsByTagName("li");
	   for (var i=0; i< navItems.length; i++) {
	         if(navItems[i].getElementsByTagName('ul')[0] != null){
				navItems[i].getElementsByTagName('ul')[0].className="none";
	            navItems[i].onmouseover=function(){
					this.className="aberto";
					this.getElementsByTagName('a')[0].className="ativo";
				}
	            navItems[i].onmouseout=function(){
					this.className="";
					this.getElementsByTagName('a')[0].className="";
				}
	         }
	   }
	}
} 

//carrega funções
function addEvent(obj, evType, fn){
	if(obj.addEventListener)obj.addEventListener(evType,fn,true)
	if(obj.attachEvent)obj.attachEvent("on"+evType,fn)
}
//inicia as funções
addEvent(window,"load",menuheader);