[development] javascript ids of cck fields

I have just written a small module "form_enabler", which enables/disables form fields in dependency of a checkbox. http://drupal.org/project/form_enabler I integrated this with the CCK, however I need the javascript ids of all target fields (= fields that depend of a checkbox). I couldn't find a simple way to get these IDs. So I wrote a function (form_enabler_form_get_ids()), which works similar like form_builder(). It builds all #parents, processes the form (#process), sets the #id like form_builder() would do and returns an array of ids for me. This is called during hook_form_alter(). This does already work, but the actual question I have is: Can this be done easier? Have I missed anything? -fago