title: error on firefox: $.widget is not a function
body: <p>I have a few multiselect boxes from the Jquery UI on a page that work perfectly well in Chrome &amp; Safari but not in Firefox for some reason... when I load the Error Console in Firefox I see:</p>
  
  <pre><code>Error: $.widget is not a function
  Source File: http://localhost:3000/javascripts/jquery.multiselect.js?1302660373
   Line: 563
  </code></pre>
  
  <p>Any ideas why?</p>
  
  <hr>
  
  <p>edit: the line itself is within the open function right where it says "// react to option changes after initialization"</p>
  
  <pre><code>    // open the menu
  open: function(e){
      var self = this,
          button = this.button,
          menu = this.menu,
          speed = this.speed,
          o = this.options;
      widget: function(){
      return this.menu;
  },
  
  // react to option changes after initialization
  _setOption: function( key, value ){
      var menu = this.menu;
  
      switch(key){
          case 'header':
              menu.find('div.ui-multiselect-header')[ value ? 'show' : 'hide' ]();
  </code></pre>