Two fields in a form

I am trying to use the FCKEditor on a form that has two fields and running into a problem.
In the docs, there is a short statement that there can be multiple instances of an editor in the form, but I can't find an example.
In the form, I have two sections - a full description and a short description.

   
       <p><label for="fck_desc">Description</label>
      <script type="text/javascript">
         var oFCKeditor = new FCKeditor('fckDescription');
         oFCKeditor.BasePath = "<%= request.getContextPath() %>/";
         oFCKeditor.Width = 500;
         oFCKeditor.ToolbarSet = "Basic";
         oFCKeditor.Create();
      </script>
      <input type="hidden" name="fck_desc" value=""/>
   </p>
   <p><label for="fck_short_desc">Short Description</label>
      <script type="text/javascript">
         var oFCKeditor2 = new FCKeditor('fckShortDescription');
         oFCKeditor2.BasePath = "<%= request.getContextPath() %>/";
         oFCKeditor2.Width = 500;
         oFCKeditor2.ToolbarSet = "Basic";
         oFCKeditor2.Create();
      </script>
      <input type="hidden" name="fck_short_desc" value=""/>
   </p>

Then, in the javascript where I prepare the data for submission, I have this,
using jQuery to write into the hidden input fields.

  
  var oEditor = FCKeditorAPI.GetInstance('fckDescription') ;
  var fck = oEditor.GetXHTML(true);
  var fckDescription = "";
  if (fck == null || fck.length === 0) {
    fckDescription = "<p>&nbsp;</p>";
  } else {
    fckDescription = fck;
  }
  $('input[name=fck_desc]').val(fckDescription);
  var oEditor2 = FCKeditorAPI.GetInstance('fckShortDescription') ;
  //var fckShort = oEditor2.GetXHTML(true);
  //alert(fckShort);
  //var fckShortDescription = "";
  //if (fckShort == null || fckShort.length === 0) {
  //  fckShortDescription = "<p>&nbsp;</p>";
  //} else {
  //  fckShortDescription = fckShort;
  //}
  $('input[name=fck_short_desc]').val(fckShortDescription);

The full description works.
However, with the short description, I get a javascript error.
Trying to comment things out to see where it occurs,
it seems to happen immediately when I call
var oEditor2 = FCKeditorAPI.GetInstance('fckShortDescription') ;

I am clearly doing something wrong.
Can someone help me understand what is going on and how to
correctly use two editor instance in the same page / form?

Thanks.