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  <?php
     function filter_where($where = '') {
     //only show posts published within the last 30 days
     $where .= " AND post_date > '" . date('Y-m-d', strtotime('-7 days')) . "'";
     return $where;
     }
     add_filter('posts_where', 'filter_where');

     // Query posts
     query_posts( 'cat=3&posts_per_page=1&orderby=rand' );

     // The Loop
     if (have_posts()) : while ( have_posts() ) : the_post(); ?>
	 
	 
  <?php the_content(); ?>
	 
	 <?php
     endwhile; endif;

     //remove the filter
     remove_filter('posts_where', 'filter_where');

     // Reset Query
     wp_reset_query();
?>