[Zope] putting file into just created directory

I have a document which looks like this : <dtml-call expr="photoArchive.manage_addFolder(id=photo_title, title='')"> <dtml-call expr="photoArchive.[photo_title].manage_addImage(id='', title=photo_title, file=file)"> Which gets called with photo_title, id and file as arguments. In the second call I want to add the image to the newly created folder, but I have found that just using the photo_title argument does not do it. The brackets[] are not in the code, just to highlight what does not work. Any suggestions would be highly appreciated. -jorg