CK and dynamic editor changes?

Hello,

i try the code below and add this code

      CKEDITOR.replace('kikeditor',
         {
            skin : 'office2003'
         });

without this code above all works fine but when i add this code in the code below i get the editor at the first dblclick and when i reload the text via ajax and doubleclick again on the text i get the error:

"instance kikeditor already exists. How can i fix this problem?

   <script id="headscript" type="text/javascript">
   //<![CDATA[

// Uncomment the following code to test the "Timeout Loading Method".
// CKEDITOR.loadFullCoreTimeout = 5;

window.onload = function()
{
   // Listen to the double click event.
   if ( window.addEventListener )
      document.body.addEventListener( 'dblclick', onDoubleClick, false );
   else if ( window.attachEvent )
      document.body.attachEvent( 'ondblclick', onDoubleClick );

};

function onDoubleClick( ev )
{
   // Get the element which fired the event. This is not necessarily the
   // element to which the event has been attached.
   var element = ev.target || ev.srcElement;

   // Find out the div that holds this element.
   element = element.parentNode;

   if ( element.nodeName.toLowerCase() == 'div'
       && ( element.className.indexOf( 'editable' ) != -1 ) )
      replaceDiv( element );
      
      CKEDITOR.replace('kikeditor',
         {
            skin : 'office2003'
         });
}

var editor;

function replaceDiv( div )
{
   if ( editor )
      editor.destroy();

   editor = CKEDITOR.replace( div );
}

   //]]>
   </script>