Hey All, I'm experimenting with zope again, playing with the REQUEST object and form objects. In my latest delimma, I've got the following snippet: <dtml-if expr="check_box == ('on')"> The check box is checked! </dtml-if> What I don't get: if the checkbox is checked in the form, then this works, and I get the output. If it isn't checked, then I get an error saying that the checkbox ("check_box" in the form) isn't defined. This is borne out as well by <dtml-var expr="REQUEST.form">, which shows a text box's name and the value that it holds (whether it holds a value or not), and the checkbox's name and value ('on'), when it's checked. If it isn't checked, it isn't there at all. So, I guess I'm going to have to look to see whether it's there or not, right? How would I do that? Thanks for the help! Russell