function chkFrame()
{   
  nav3plus = false;    
  if (navigator.userAgent.indexOf ("Mozilla") != -1)      
  {     
    nav3plus = parseInt(navigator.appVersion.substring(0,1)) >= 3     
  }    
  if (top == self)     
  {    
    if (nav3plus)      
    {     
      self.location.replace('frameset.php'+window.location.search );     
    }     
    else     
    {     
      self.location.replace('index.html');     
    }    
  }       
}