Hi Diego, Diego Rodrigo Neufert writes:

When I use <dtml-unless "attach_file.filename">

I got a NameError.... This must be "NameError 'attach_file'", right?

Do you know a solution to this? because when I dont specify anything in a field zope just dont know about it... Apparently, browsers behave differently. My Netscape 4.7 interpretes an empty file control as successful and sends the corresponding name/value pair (with empty value).

To handle both behaviours, you can use: <dtml-unless "REQUEST.form.has_key('attach_file') and attach_file.filename"> <!-- error; empty file control --> </dtml-unless> Dieter