I'm using drupal 7 and i'm having some problems customizing the search results page. I have a form altered in template.php file where i have created my fields like this:

$form['basic']['keys']['search_string'] = array
        '#prefix' => '<div class="search_title">',
        '#suffix' => '</div>',

I also created a page search-results.tpl.php where i just wrote:


When i submit the form i get on /search/node and another form is displayed with the following error:

 Notice: Undefined index: keys in search_form_validate() (line 145 ..)Please enter some keywords.

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