Ridirect Wordpress attachment pages

remove-attachments.php

<?php
/*
Plugin Name: Kill Attachment Pages
Plugin URI: http://pmg.co/
Description: Redirects all attachment pages to their parent page
Version: 1.0
Author: Christopher Davis
Author URI: http://pmg.co/people/chris
License: creative commons/GPL2
*/


add_action( 'template_redirect', 'wpse27119_template_redirect' );
function wpse27119_template_redirect()
{
	// get out of here if we're not headed to an attachment page	
	if( ! is_attachment() ) return;	
	
	// Find the $post variable representing the page where we're heading
	global $post;
	if( empty( $post ) ) $post = get_queried_object();
	
	// Find the permalink of our parent post
	$link = get_permalink( $post->post_parent );
	
	// redirect to the parent page
	wp_redirect( $link, '301' );
	exit(); // always call exit after wp_redirect
}