function RandComment(url){
  new Ajax.Updater('rcomment',
    url+'request.php',
    { onComplete: function(){
        new Effect.SlideDown('rcomment',{
          duration: 1.0,
          afterFinish: setTimeout(function(){
				 RandCommentReload();
          },4000)
        });
      },
      asynchronous:true
    }
  );
}
function RandCommentReload(){
      RandComment(url);
}