how to paginate custom post type in wordpress

Paginate Custom Posts

<?php
	$docs = get_posts('numberposts=-1&post_type=page&post_parent=36&orderby=title&order=ASC');
	$faculty = array();
	foreach ($docs as $doc) {
		array_push($faculty, $doc->ID);
	}
	$currentElement = array_search($post->ID, $faculty);
	$next = isset( $faculty[$currentElement+1] ) ? $faculty[$currentElement+1] : null;
	$prev = isset($faculty[$currentElement-1]) ? $faculty[$currentElement-1] : null;
	if ( !is_null($prev) ) { 
		$prevDoc = query_posts( array('page_id' => $prev) );
		$prevDocHref = '<a href="/faculty/' . $prevDoc[0]->post_name .'" class="docArrows"><img src="'. get_bloginfo('template_directory') .'/images/prevDocArrow.jpg" alt="Previous" /></a>';
	}
	if ( !is_null($next) ) { 
		$nextDoc = query_posts( array('page_id' => $next) );
		$nextDocHref = '<a href="/faculty/' . $nextDoc[0]->post_name .'" class="docArrows"><img src="'. get_bloginfo('template_directory') .'/images/nextDocArrow.jpg" alt="Next" /></a>'; 
	}
	?>
	<?= $prevDocHref ?>
	<a href="http://cancergrace.net/faculty/">
		<img src="<?php bloginfo('template_directory'); ?>/images/meet.jpg" alt="" />
	</a>
	<?= $nextDocHref ?>