function createDropDown(){

	var menuName=document.getElementById("menu1").getElementsByTagName("ul");
	for(var i=0; i<menuName.length; i++){
   		menuName[i].parentNode.onmouseover=function(){
    			this.getElementsByTagName("ul")[0].style.visibility="visible";
    		}
  		menuName[i].parentNode.onmouseout=function(){
    			this.getElementsByTagName("ul")[0].style.visibility="hidden";
    		}
	}//end for
		
}//end createDropDown



if (window.addEventListener)
window.addEventListener("load", createDropDown, false)
else if (window.attachEvent)
window.attachEvent("onload", createDropDown)