title: modifying jquery widget
body: <p>I'm using Eric Hynds' multiselect widget.</p>
  
  <p>I'd like to modify it, adding an option and including an extra step in the _refresh method. Now I can modify the plugin easily enough to accomplish my aims, but what I'd like to do is to create a wrapper or similar that means I can update the widget in future, while keeping my changes separate.</p>
  
  <p>The widget is built using jquery ui 1.8 widget factory .</p>
  
  <p>What is the best way to achieve my aims?</p>