<?php
    $prev_post = get_previous_post();
    if($prev_post) {
       $prev_title = strip_tags(str_replace('"', '', $prev_post->post_title));
       echo "\t" . '<a rel="prev" href="' . get_permalink($prev_post->ID) . '" title="' . $prev_title. '" class=" ">&laquo; Previous post<br /><strong>&quot;'. $prev_title . '&quot;</strong></a>' . "\n";
                    }
    
    $next_post = get_next_post();
    if($next_post) {
       $next_title = strip_tags(str_replace('"', '', $next_post->post_title));
       echo "\t" . '<a rel="next" href="' . get_permalink($next_post->ID) . '" title="' . $next_title. '" class=" ">Next post &raquo;<br /><strong>&quot;'. $next_title . '&quot;</strong></a>' . "\n";
                    }
    ?>