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/
<?phpfunction SearchFilter($query) { if ($query->is_search) { $query->set('post_type', 'post'); } return $query;}add_filter('pre_get_posts','SearchFilter');?>
This wp forum page has a bunch of different examples of how to do this depending on where you want to edit your site (index.php or wp-includes/query.php are your options I believe):
http://wordpress.org/support/topic/possible-search-only-posts-exclude-pages