Wordpress Search Function to only search posts

Answer is here

http://www.shilling.id.au/2011/06/23/wordpress-search-only-show-post-and-not-pages/

<?php
function SearchFilter($query) {
    if ($query->is_search) {
        $query->set('post_type', 'post');
    }
    return $query;
}
add_filter('pre_get_posts','SearchFilter');
?>

Simply add <input type="hidden" name="post_type" value="post" /> to the theme search form... regards!