function breakoutOfFrame()
      {
              if (top.location != location) {
                        top.location.href = document.location.href ;
                             }
                 }

  function previewComment() {
          var commenttext = document.commentform.comments.value.replace(/\n/g,'<br />');
               window.open('/previewcomment.php?author='+document.commentform.name.value+'&comment='+commenttext,'Comment preview','width=500,height=200');
                 }