JS for selecting a file

Hi,

First of all, thanks for a great WYSIWYG editor!
My english is not the best. So please ask if you don't understand my question.

I have a external Filemanager with this code for selecting files.

function selectFile(url)
{
   if(url != '')
   {
      window.opener.SetUrl(url) ;
      window.close() ;
   }
   else
   {
      alert(noFileSelected);
   }
}

This worked in FCKeditor but not in CKeditor.
What should I write instead of the above?

Thanks in advance