title: Object is not a function on call to dialog() function
body: <p>I keep getting "dialogDiv.dialog is not a function".</p>
  
  <p>I'm simply trying to invoke the jQueryUI dialog off my reference to the div.</p>
  
  <p>So incoming is the divID, for example "myDiv".
  Then I set it to a variable and wrap it in $("#" + myDiv); so that now I have a reference to it in a nice clear variable.
  Then I try to invoke the dialog function and get that error.</p>
  
  <p>not sure why and it's driving me nuts.</p>
  
  <pre><code>function showDialog(divID) 
  {
      // Get reference to the div element
      var dialogDiv = $("#" + divID);
      alert("dialogDiv:" + dialogDiv);
  
      dialogDiv.dialog
      (
          {
              bgiframe: true,
              modal: true,
              autoOpen: false,
              show: 'blind'
          }
      )
  
      dialogDiv.dialog("open");
  }
  </code></pre>