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One issue that comes up from ApacheSolr being a separate search page is that the search form does not go to it by default. This is the $search_box in the page.tpl.php template. The way we change this behavior is to add a new submission handler to that form. You can create a custom module for this or put it in your custom theme. <?php/*** Implementation of hook_form_alter()*/function custommodule_form_alter(&$form, $form_state, $form_id) {  // Add submission handler to redirect to apachesolr  if ($form_id == 'search_theme_form') {    // Add a submit, because the search form redirects to a specific place    $form['#submit'][] = 'custommodule_search_submit';  }}/*** Implementation of form submit function*/function custommodule_search_submit($form, &$form_state) {  // Get form ID  $form_id = $form['form_id']['#value'];  // Create new redirect  $form_state['redirect'] = 'search/apachesolr_search/'. trim($form_state['values'][$form_id]);}?>