title: "TypeError: jQuery.easing[this.easing] is not a function" in jQuery 1.9.1
body: <p>For the first time in too many months (blush), I upgraded my jQuery stuff.  I'm now on:</p>
  
  <ul>
  <li>jquery-1.9.1.js</li>
  <li>jquery-ui-1.10.2.custom.js (used ThemeRoller, and included all components, including the Effects Core, which mentions easing in its description)</li>
  </ul>
  
  <p>I also upgraded to the most recent versions of jquery.multiselect and jquery.multiselect.filter plugins.  When I try to close one of the multiselect menus, I get this error:</p>
  
  <pre><code>TypeError: jQuery.easing[this.easing] is not a function
  jquery-1.9.1.js (line 9033)
  </code></pre>
  
  <p>Note that although I'm using the multiselect plugin when the error occurs, the actual error is in the main jQuery file.  The code is:</p>
  
  <pre><code>/*9031*/ if ( this.options.duration ) {
  /*9032*/   this.pos = eased = jQuery.easing[ this.easing ](
  /*9033*/     percent, this.options.duration * percent, 0, 1, this.options.duration
  /*9034*/   );
  /*9035*/ }
  </code></pre>
  
  <p>Did I forget to update some file?  Googling about it, others with the same complaint seem to all be trying to use some sort of additional easing plugin, but I'm not.</p>