function addLoadEvent(func)
{

  var oldonload = window.onload;   
  if (typeof window.onload != 'function') 
  {   
    window.onload = func;   
  } 
  else 
  {   
    window.onload = function() 
    {   
      if (oldonload) 
      {   
        oldonload();   
      }   
      func();   
    }   
  }   
}