diff --git a/template.php b/template.php
index fc92380..d4d4ce8 100644
--- a/template.php
+++ b/template.php
@@ -452,3 +452,86 @@ function zen_form_node_form_alter(&$form, &$form_state, $form_id) {
     }
   }
 }
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function zen_form_search_form_alter(&$form, $form_state) {
+  if (isset($form['module']) && $form['module']['#value'] == 'node' && user_access('use advanced search')) {
+    // Keyword boxes:
+    $form['advanced'] = array(
+      '#type' => 'fieldset',
+      '#title' => t('Advanced search'),
+      '#collapsible' => TRUE,
+      '#collapsed' => TRUE,
+      '#attributes' => array('class' => array('search-advanced')),
+    );
+    $form['advanced']['keywords-fieldset'] = array(
+      '#type' => 'fieldset',
+      '#title' => t('Keywords'),
+      '#collapsible' => FALSE,
+    );
+    $form['advanced']['keywords-fieldset']['keywords'] = array(
+      '#prefix' => '<div class="criterion">',
+      '#suffix' => '</div>',
+    );
+    $form['advanced']['keywords-fieldset']['keywords']['or'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Containing any of the words'),
+      '#size' => 30,
+      '#maxlength' => 255,
+    );
+    $form['advanced']['keywords-fieldset']['keywords']['phrase'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Containing the phrase'),
+      '#size' => 30,
+      '#maxlength' => 255,
+    );
+    $form['advanced']['keywords-fieldset']['keywords']['negative'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Containing none of the words'),
+      '#size' => 30,
+      '#maxlength' => 255,
+    );
+    // Node types:
+    $types = array_map('check_plain', node_type_get_names());
+    $form['advanced']['types-fieldset'] = array(
+      '#type' => 'fieldset',
+      '#title' => t('Types'),
+      '#collapsible' => FALSE,
+    );
+    $form['advanced']['types-fieldset']['type'] = array(
+      '#type' => 'checkboxes',
+      '#prefix' => '<div class="criterion">',
+      '#suffix' => '</div>',
+      '#options' => $types,
+    );
+    $form['advanced']['submit'] = array(
+      '#type' => 'submit',
+      '#value' => t('Advanced search'),
+      '#prefix' => '<div class="action advanced-search-submit">',
+      '#suffix' => '</div>',
+      '#weight' => 99,
+    );
+    // Languages:
+    $language_options = array();
+    foreach (language_list('language') as $key => $entity) {
+      $language_options[$key] = $entity->name;
+    }
+    if (count($language_options) > 1) {
+      $form['advanced']['lang-fieldset'] = array(
+        '#type' => 'fieldset',
+        '#title' => t('Languages'),
+        '#collapsible' => FALSE,
+        '#collapsed' => FALSE,
+      );
+      $form['advanced']['lang-fieldset']['language'] = array(
+        '#type' => 'checkboxes',
+        '#prefix' => '<div class="criterion">',
+        '#suffix' => '</div>',
+        '#options' => $language_options,
+      );
+    }
+    $form['#validate'][] = 'node_search_validate';
+  }
+}