In your skins use :-

<?php 
echo '<span class="prev">';
previous_post( 'Previous posts' );
echo '</span><span class="next">';
next_post( 'Next posts' );
echo '</span>';
?>

¥

Thanks but this doesn't help me much. I don't want to add span tags which have no use other than adding a class which usually is added directly to the link tags. I simply want to add the classes to the <a href=....>. There must be some part in the code of the script where to do it. I just haven't found it. It's definitly not in the skin files but probably somewhere in the functions.

In that case you need to look in b2evocore/_functions_b2posts.php (or something like that) for the two functions that you need to hack. A minimal hack would be to add a parameter for the class name, that way you'll have less work to do if you ever upgrade (or if they change the params).

function next_posts_link($label='#',$link_class = 'next', $max_page=0, $page='')
{
	global $p, $paged, $result, $request, $Settings;

	if( $label == '#' ) $label = T_('Next Page').' >>';

	if ($Settings->get('what_to_show') == 'paged')
	{
		global $MainList;
		if (!$max_page)	$max_page = $MainList->get_max_paged();
		if (!$paged) $paged = 1;
		$nextpage = intval($paged) + 1;
		if (empty($p) && (empty($paged) || $nextpage <= $max_page))
		{
			echo '<a href="';
			echo next_posts($max_page, $page);
			echo '" class="'.$link_class.'">'. htmlspecialchars($label) .'</a>';
		}
	}
}



/**
 * previous_posts_link(-)
 *
 *
 */
function previous_posts_link($label='#',$link_class = 'prev' ,$page='')
{
	global $Settings;

	if( $label == '#' ) $label = '<< '.T_('Previous Page');

	global $p, $paged;
	if (empty($p)  && ($paged > 1) && ($Settings->get('what_to_show') == 'paged'))
	{
		echo '<a href="';
		echo previous_posts( $page );
		echo '" class="'.$link_class.'">'.  htmlspecialchars($label) .'</a>';
	}
}

and then call them in your skin with

previous_posts_link( 'Previous posts' , 'my_previous_class');
next_posts_link( 'Next posts', 'my_next_class' );

¥

Thanks a lot. It didn't work for me how you suggested since I couldn't find the place in my skin but anway I changed it directly in the functions

     echo '<a class="prev" href="';
      echo previous_posts( $page );
      echo '" class="'.$link_class.'">'.  htmlspecialchars($label) .'</a>'; 

But without your help I simply didn't find the place in the functions although searching.

At least this works for me.

Nice tip. Helped me a lot. Thank you.