mon/ui_utils.js"></script>

<style>
/* taken from jqueryui docs and adjusted a bit */
#sortable { list-style-type: none; margin: 0; padding: 0; width: 90%; margin-top:2px; margin-left: 2px;}
#sortable li { margin: 3px; padding: 2px; width: 34px; height: 34px; float: left; font-size: 8px; }
#sortable li span { position: absolute; margin-left: -12px; }
</style>

<script>
var OLDIX;
var genProblem = function() {
  var ITEMS = core.shuffle(ui_utils.PEOPLE_NAMES.slice());

  // build items with d3js
  var ul = d