[development] custom search form

I'm trying to build a form to search The intro page shows the search form, and bellow, a grid When the user set some fields, and click OK, the grid must show the filtered result There is any node in drupal.org about it? I'm fighting with some weird problems, like after click OK, the hole browser shows nothing, blank! I figured out that the drupal_get_form() from my _form function cause that problem, if I just show the grid (no search form), the blank problem do not hepend. TIA for any tip Thanks Feijó