<!-- Всплывающее окно цитирования -->
<style>
#Bubble {
  display: none;
  width: 100px;
  height: auto;
  padding: 5px;
  text-align: center;
  z-index: 10;
  border: 1px black solid;
  background: white;
  background-image: url(http://www.iconsearch.ru/uploads/icons/crystalclear/16x16/comment.png);
  background-repeat: no-repeat;
  background-position: 10px 4px;
  padding-left: 12px;
}
</style>
<div id="Bubble"><span><a href="javascript:quote('', 0)">Цитировать</a></span></div>
<script>
var fresh = false;
$('.post').mouseup(function(pos) {
  var theSelection = '';
  if (window.getSelection && !$.browser.opera) { theSelection = window.getSelection().toString(); }
  else if (document.getSelection) { theSelection = document.getSelection(); }
  else if (document.selection) { theSelection = document.selection.createRange().text; }
  if (!(theSelection == '' || typeof theSelection == 'undefined' || theSelection == null) && !(fresh))
  {
    $("#Bubble").css({ 'position': 'absolute', 'left': pos.pageX+'px', 'top': (pos.pageY-13)+'px', 'display': 'none' });
    $("#Bubble span").html($(this).find("li.pl-quote").html());
    $("#Bubble").fadeIn(200);
    fresh = true;
  }
  else if (fresh)
  { fresh = false; }
});
$('.post').mousedown(function() {
  if (fresh) { $("#Bubble:visible").hide(200); fresh = false;}
});
$('#Bubble span').click(function() {
  $('#Bubble').hide(200);
  fresh = false;
});
</script>

Пример