function addTab( title, url ) 
{ 
  if ((typeof window.sidebar == "object") && 
	  (typeof window.sidebar.addPanel == "function")) 
     { 
		window.sidebar.addPanel( title, url, "" );
	 } 
   else 
   { 
	 alert('Sorry, you can only add the tab if you\'re running Netscape 6 or Mozilla.');
	} 
}