Pop-up quote button when selecting text in a post.
When you select text in the post, a Quote button appears with an active link. In order to remove the button, you just need to click somewhere nearby.
http://clip2net.com/clip/m123035/thumb640/1333720148-clip-2kb.png
Author: kozhilya
Platform: MyBB

Code:
<!-- Pop-up quote button -->
<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)">Quote</a></span></div>
<script>
var fresh = false;
$('.post').mouseup(function(pos) {
  var idString = $(this).find('.post-content').attr("id");
  var id = idString.substring(1, idString.indexOf('-'));
  var aut = $(this).find('li.pa-author a').text();
  var theSelection = '';
  if (window.getSelection && !$.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+'px', 'display': 'none' });
    $("#Bubble span").html($(this).find("li.pl-quote").html());
    $("#Bubble").fadeIn(200);
    fresh = true;
  }
  else if (fresh)
  { fresh = false; }
});
$('.post').click(function() { 
  if (!(fresh)) { $("#Bubble:visible").hide(200); }
});
$('#Bubble span').click(function() { 
  $('#Bubble').hide(200);
  fresh = false;
});
</script>

Short version

Code:
<!--Pop-up quote button--><div id="Bubble" style="display:none;position:absolute;z-index:100000"><span></span></div><script>function PopUpPL_Quote(){var fresh=false,SSsq='<img src="http://uploads.ru/i/n/L/f/nLfG0.png">';$("#Bubble").prependTo("body");$('.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({'left': (pos.pageX+5)+'px', 'top':(pos.pageY+4)+'px', 'display': 'none' });$("#Bubble span").html('<a href="'+$(this).find("li.pl-quote a:first").attr("href")+'">'+SSsq+'</a>');$("#Bubble").fadeIn(200);fresh=true}else if(fresh){fresh=false}});$('#Bubble span').click(function(){$('#Bubble').hide(200);fresh=false});$('.post').mousedown(function(){if(fresh){$("#Bubble:visible").hide(200);fresh=false}});}
if($("#pun-viewtopic").length){PopUpPL_Quote()}
</script>

U can change a link to the picture (link in the code):

<img src="http://uploads.ru/i/n/L/f/nLfG0.png"