WordPress: Get prev/next post link

gistfile1.aw

<?php

/*
 * @param $prev_or_next string. Either 'prev' or 'next'
 *
 * @return string empty or HTML link to prev/next post
 */
function get_star_post_link( $prev_or_next ) {

	$pon = $prev_or_next;
	if ( ! in_array( $pon, array( 'prev', 'next' ) ) ) 
		$pon = 'prev';

	$text = array( 'prev' => '&larr; Previous Post', 'next' => 'Next Post &rarr;' );
	$text = $text[ $pon ];

	if ( 'next' == $pon )
		$adj = get_next_post();
	if ( 'prev' == $pon )
		$adj = get_previous_post();
	
	$link = '';
	if ( ! is_null( $adj->ID ) ) {
		$href = get_permalink( $adj->ID );
		$title = get_the_title( $adj->ID );
		$link = "<a href='$href' title='$title'>{$text}</a>";
	}
	
	return $link;

}
/*
	Use like so:

	$next = get_star_post_link('next');
	$prev = get_star_post_link('prev');

	echo '<div class="navigation">';
	echo empty( $prev ) ? '' : "<div class='navigation-prev'>$prev</div>";
	echo empty( $next ) ? '' : "<div class='navigation-next'>$next</div>";
	echo '</div>';
*/