Add Photobox support to WordPress galleries

gistfile1.php

<?php

class Gallery_Javascript {
  private $link;

	function __construct() {
		add_filter( 'post_gallery', array( $this, 'enqueue_script' ), 20, 2 );
		add_filter( 'gallery_style', array( $this, 'add_class' ) );
	}

	function enqueue_script( $output, $attr ) {
		global $wp_styles;

		if( $output )
			return $output;

		$this->link = isset( $attr['link'] ) && 'file' == $attr['link'] ? true : false;

		if( $this->link ) {
			wp_enqueue_script(
				'jquery-photobox',
				plugins_url( '/gallery/photobox/photobox.js', __FILE__ ),
				array( 'jquery' ),
				'1.4.5'
			);

			wp_enqueue_style(
				'jquery-photobox',
				plugins_url( '/gallery/photobox/photobox.css', __FILE__ ),
				array(),
				'1.4.5',
				'all'
			);

			wp_enqueue_style(
				'jquery-photobox-ie8',
				plugins_url( '/gallery/photobox/photobox.ie.css', __FILE__ ),
				array(),
				'1.4.5',
				'all'
			);

			$wp_styles->add_data( 'jquery-photobox-ie8', 'conditional', 'lt IE 9' );
		}

		return $output;
	}

	function add_class( $output ) {
		if( $this->link ) {
			$output = substr_replace( $output, "", -2 );
			$output .= " gallery-link-file'>";
		}

		return $output;
	}
}
new Gallery_Javascript;

gistfile2.js

jQuery( ".gallery-link-file" ).each(function( index ) { jQuery('#'+jQuery(this).attr('id')).photobox('a', { thumbs:true }); });