function doPreview() {
  var title = document.comments_form.title.value;
  var comment  = document.comments_form.comment.value;
  comment = comment.replace(/\x0D\x0A/g, "<br \/>");
  comment = comment.replace(/\x0D/g, "<br \/>");
  comment = comment.replace(/\x0A/g, "<br \/>");
  document.getElementById("preview").innerHTML = '<h4 class="comments-title">' + title + '<\/h4>' + comment;
}