//add event function
function addEvent(obj, evType, fn)
{
 if (obj.addEventListener){
   obj.addEventListener(evType, fn, true);
   return true;
 }
 else if (obj.attachEvent)
 {
   var r = obj.attachEvent("on"+evType, fn);
   return r;
 }
 else
 {
   return false;
 }
}

function getStyle()
{
  if (document.getElementById)
  { 
  	var topmenu_bar = document.getElementById("topmenu_bar");
  	if (topmenu_bar.currentStyle)
  	{
  		var topmenu_style = topmenu_bar.currentStyle["display"];
  	}
  	else if (window.getComputedStyle)
  	{
  		var topmenu_style = document.defaultView.getComputedStyle(topmenu_bar,null).getPropertyValue("display");
  	}
  	else if (document.getComputedStyle)
  	{
  		var topmenu_style = document.defaultView.getComputedStyle(topmenu_bar,null).getPropertyValue("display");
  	}
  	
  	return (topmenu_style=="block") ? true : false;
	}
}