Greetings! This may be a dumb question, but I can't seem to find any Drupal core example code that does what I need. In a module settings form, I have a "checkboxes" form element with a list of options of the format: array($short_name => $description, ...) The goal (which is being achieved at the HTML level) is to have code like this: <label class="option"><input type="checkbox" name="..." value="$short_name"/> $description</label> That's all working fine, and the returned values for checked boxes are as desired. I have no problem getting the FAPI to render and process the form correctly, but what's happening is that any *unchecked* boxes are being set to the value zero rather than being left unset. This is causing extra cruft in my database records because what I really want is just the list of shortnames of the checked values. I've been through the docs and examples, and looked at several parts of Drupal core, to see how to use #validate on a form, but is there a way to use it on just one form element and then *change* the value of that element by removing undesired parts? Or is that something I should do in #submit? Several parts of the docs have "almost" what I need, I think: http://drupal.org/node/51104 http://drupal.org/node/58689 One of the reasons this is so tricky is that the form element in question happens to be used in the module settings (where I don't have control over the processing) and also in the user preferences (where I also don't have control over the processing). I need to be able to hook in somewhere between when the browser sends via POST and when the module and user settings get stored. What's the correct approach (in general terms, not looking for someone to write the code for me) to do this? Thanks for any suggestions. Syscrusher -- ------------------------------------------------------------------------------- Syscrusher (Scott Courtney) Drupal page: http://drupal.org/user/9184 syscrusher at 4th dot com Home page: http://4th.com/