function initMainMenu(){
	var as = document.getElementById("menu").getElementsByTagName("a");
	for(i=0; i<as.length; i++){
		var d = as[i].getAttribute("drop");
		if(d && document.getElementById(d)){
		    var menu = document.getElementById(d);
			as[i].parentNode.menu = menu;
			as[i].parentNode.onmouseover = function(evt){
				this.menu.style.left= (findPosX(this))+"px";
				this.menu.style.top=(findPosY(this)+this.offsetHeight-1)+"px";
				this.menu.style.width="150px";
				//menu.position="absolute";
				//menu.zIndex=100000;
				this.menu.style.display="block";
				//Element.show(menu);
			};
			as[i].parentNode.onmouseout = function(evt){
				Element.hide(this.menu);
			};
			
			menu.onmouseover = function(evt){this.style.display="block"};
			menu.onmouseout = function(evt){this.style.display="none"};
		}
	}
}
function initTree(tree){
   var as = tree.getElementsByTagName("a");
   for(i=0; i<as.length; i++){
   	   if(as[i].className.indexOf("plus")>-1){
   	      as[i].onclick = function(){
   	          if(this.parentNode.lastChild.className.indexOf("hide")>-1){
   	             this.className ="plus_selected";
   	             this.parentNode.lastChild.className="";
   	          }else { 
	   	          this.className ="plus";
	   	          this.parentNode.lastChild.className="hide";
   	          }
   	      }
   	   }
   }
}
function poll_submit(btn,url,id,form){
   var pars = Form.serialize(form);
   if(pars=="") alert("您至少需要选择一项");
   else{
	   pars = pars.replace(new RegExp("poll_item=",'g'),"").replace(new RegExp("&",'g'),",");
	   pars ="poll_item="+pars;
		 function callback(res){
		 		alert(res.responseText);
		 		btn.disabled = true;
		 } 
		 var myAjax = new Ajax.Request(url,{method: 'POST', parameters:"id="+id+"&"+pars, onComplete: callback});
	 }
}
function poll_result(btn,refreshurl,id,form){
    var pars = 'id=custom_portlet_'+id+'&view=result&class=PollPortlet&style=rect&effect=null&params={"custom_portlet_id":'+id+'}'; 
		var box = $('portlet_custom_portlet_'+id+'_body');
		box.innerHTML="loading...";
		var myAjax = new Ajax.Request(refreshurl,{method: 'POST', parameters:pars, onComplete: callback});
    function callback(res){
     	box.innerHTML = res.responseText;
    } 
}