orig

<script type="text/javascript">
$(document).ready(function(){
  $('#sampletoggles li').each(function(index) {
    var key = index+1;
    console.log('sample' + key);
    $('#sample' + key).dialog({
      dialogClass: 'sample',
      autoOpen: false,
      width: 640,
      height: 700,
      modal: true,
      closeOnEscape: true,
      close: function(event, ui) { return false; }
    });
    $('#sample' + key + 'toggle').click(function(){
      $('#sample' + key).dialog('open');
      return false;
    });
  });
});
</script>

proposed
<script type="text/javascript">
$(document).ready(function(){
  $('#sampletoggles li').each(function(index) {
    var key = index+1;
    console.log('sample' + key);
    var dialog = $('#sample' + key).dialog({
      dialogClass: 'sample',
      autoOpen: false,
      width: 640,
      height: 700,
      modal: true,
      closeOnEscape: true,
      close: function(event, ui) { return false; }
    });
    $(this).click(function(){
      dialog.dialog('open');
      return false;
    });
  });
});
</script>