[Zope] Help!

Sorry if it's FAQ, but I can't find answer neither on google nor on zope.org. How to check file existance?! I want to upload file, but I don't know if it exists. So: <dtml-call "PARENTS[0].manage_delObjects('filename')"> <dtml-call "PARENTS[0].manage_addFile('filename',file,title=REQUEST['title'])"> If I omit manage_delObjects, file will be uploaded once, then zope barks. If I place manage_delObjects, the file HAVE to exist before I upload. Now how to write this code in a such way that it would handle uploads in any case? -- Roman V. Isaev http://www.aroma.ru System Administrator