Twitter bootstrap WP-e-Commerce Pagination Filter

functions.php

function bootstrap_custom_wpsc_pagination($output){
	$output = '<nav><ul class="pagination">' . $output;
	$output = str_replace(
		array( '<a', '</a>',"<span class='current'>", '</span>', __('Pages: ','wpsc')),
		array( '<li><a', '</a></li>','<li class="current active"><a href="#">', '<span class="sr-only">(current)</span></a></li>', '<li class="disabled"><span>' . __('Pages: ','wpsc') . '</span></li>'),
		$output);
	$output = $output . '</ul></nav>';
	return $output;
}
add_filter( 'wpsc_pagination', 'bootstrap_custom_wpsc_pagination' );