title: jqueryui datepicker throwing error at code relating to zIndex
body: <p>I am developing an asp.net page/application.  I have created a textbox that i set as a datepicker using the datepicker from jqueryui.  in firefox and chrome the datepicker does not render.  in IE9 the date picker renders if i ignore the error.  the error is at line 644 in jquery.ui.datepicker.js.  </p>
  
  <p>the code where the error is thrown is here.</p>
  
  <p><code>inst.dpDiv.zIndex($(input).zIndex()+1);</code></p>
  
  <p>this is the message that VS displays when it catches the error</p>
  
  <p><em>Microsoft JScript runtime error: Object doesn't support this property or method</em></p>
  
  <p>i'm not sure what is causing the issue.  I have looked for zindex issues, and the ones i'm finding are related to dialog appearing behind other elements.  i don't have the happening.</p>