<?php

    require_once('../../plugins/wolf-jplayer/incldes/jplayer-show.php'); // require
	head_script( $id, $playlist_id, $songs, $in_popup, $autoplay = false );
?>

Original function directory /wp-content/plugins/wolf-jplayer/includes/jplayer-show.php
The directory where I am trying to include the function /wp-content/themes/twentytwelve/footer.php