function bookmark(title, url, firefoxText, operaText)
{
  if (document.all)
    window.external.addFavorite(title,url);        
  else 
  {    
    var agent=navigator.userAgent.toLowerCase();        
    if(agent.indexOf("mozilla")!= -1)
      alert(firefoxText);    
    if(agent.indexOf("opera")!= -1)
      alert(operaText);
  } 
}