var menuids=["treemenu1","treemenu2"];

function buildsubmenus_horizontal(){
  for (var i=0; i<menuids.length; i++){
    var ultags=document.getElementById(menuids[i]).getElementsByTagName("ul")
  	for (var t=0; t<ultags.length; t++){
  		if (ultags[t].parentNode.parentNode.id==menuids[i]){ //if this is a first level submenu
  			ultags[t].style.top=ultags[t].parentNode.offsetHeight+"px" //dynamically position first level submenus to be height of main menu item
  			
  		}
  		else{ //else if this is a sub level menu (ul)
  		  ultags[t].style.left=ultags[t-1].getElementsByTagName("a")[0].offsetWidth+"px" //position menu to the right of menu item that activated it
  		//ultags[t].parentNode.getElementsByTagName("a")[0].className="subfoldericon"
  		}
    	ultags[t].parentNode.onmouseover=function(){
    	  this.getElementsByTagName("ul")[0].style.visibility="visible"
  	  }  
    	ultags[t].parentNode.onmouseout=function(){
      	this.getElementsByTagName("ul")[0].style.visibility="hidden"
    	}
  	}
  }
}
if (window.addEventListener)
  window.addEventListener("load", buildsubmenus_horizontal, false)
else if (window.attachEvent)
  window.attachEvent("onload", buildsubmenus_horizontal)