--- custom_search_box.module	2009-03-21 11:50:13.000000000 -0500
+++ custom_search_box_new.module	2009-03-22 00:47:28.000000000 -0500
@@ -89,6 +89,9 @@ function custom_search_box_form_alter(&$
           $form['submit']['#value'] = variable_get('custom_search_box_submit_text', t('Search'));
           $form['submit']['#type'] = variable_get('custom_search_box_submit_button', 'submit');
           $form['submit']['#name'] = 'op';
+          if (variable_get('custon_search_box_default') == '') {
+             $form['submit']['#attributes'] = array('style' => 'display:none;');
+          }
           if ($form['submit']['#type'] == 'image_button') {
              $form['submit']['#src'] = variable_get('custom_search_box_image_path', '');
           }