Replace attachment when uploading a new attachment

/***
 * replaceAttachment
 *
 * replaces an existing attachment in a richtext item with a newly uploaded attachment.
 * Only one attachment will be left in the richtext item.
 *
 * @author Sven Hasselbach
 * @param ds DataSource document which contains the target rich text item
 * @param fileUploadControlId id of the file upload control
 * @param rtItemName Name of target richtext item
 *
 ***/
function replaceAttachment( ds:NotesXspDocument, fileUploadControlId:String, rtItemName:String ){
   var con = facesContext.getExternalContext();
   var request:com.sun.faces.context.MyHttpServletRequestWrapper = con.getRequest();
   var map:java.util.Map = request.getParameterMap();
   var fileDataName = getClientId( fileUploadControlId ) ;
   var fileData:com.ibm.xsp.http.UploadedFile = map.get( fileDataName );
	
   if( fileData == null ){
      return;
   }

   var tempFile:java.io.File = fileData.getServerFile();
   var correctedFile = new java.io.File( tempFile.getParentFile().getAbsolutePath() + 
   java.io.File.separator + fileData.getClientFileName() ); 

   var success = tempFile.renameTo(correctedFile);
   try{
      ds.removeAllAttachments( rtItemName );
   }catch(e){}

   var rtFiles:NotesRichTextItem = null;
   if(!(ds.getDocument().hasItem( rtItemName ))){
      rtFiles = ds.getDocument().createRichTextItem( rtItemName )
   }else{
      rtFiles = ds.getDocument().getFirstItem( rtItemName);
   } 

   rtFiles.embedObject(lotus.domino.local.EmbeddedObject.EMBED_ATTACHMENT, "",
      correctedFile.getAbsolutePath(), null); 
   correctedFile.renameTo(tempFile);

   ds.save();
}