function RandComment(url){
  new Ajax.Updater('rcomment',
    url+'request.php',
    { onComplete: function(){
        new Effect.Appear('rcomment',{
          duration: 2.0,
          afterFinish: function(){
            setTimeout('RandCommentReload()',100);
          }
        });
      },
      asynchronous:true
    }
  );
}
function RandCommentReload(){
  new Effect.Fade('rcomment',{
    afterFinish: function(){
      RandComment(url);
    }
  });
}