Index: wp-includes/link-template.php
===================================================================
--- wp-includes/link-template.php	(revisión: 7162)
+++ wp-includes/link-template.php	(copia de trabajo)
@@ -662,7 +662,7 @@
 	echo clean_url(get_next_posts_page_link($max_page));
 }
 
-function next_posts_link($label='Next Page »', $max_page=0) {
+function next_posts_link($label='Next Page »', $max_page=0, $class='') {
 	global $paged, $wp_query;
 	if ( !$max_page ) {
 		$max_page = $wp_query->max_num_pages;
@@ -673,7 +673,10 @@
 	if ( (! is_single()) && (empty($paged) || $nextpage <= $max_page) ) {
 		echo '<a href="';
 		next_posts($max_page);
-		echo '">'. preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $label) .'</a>';
+		echo '"';
+		if ( !empty($class) )
+			echo ' class="'. $class . '"';
+		echo '>'. preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $label) .'</a>';
 	}
 }
 
@@ -692,12 +695,15 @@
 	echo clean_url(get_previous_posts_page_link());
 }
 
-function previous_posts_link($label='&laquo; Previous Page') {
+function previous_posts_link($label='&laquo; Previous Page', $class='') {
 	global $paged;
 	if ( (!is_single())	&& ($paged > 1) ) {
 		echo '<a href="';
 		previous_posts();
-		echo '">'. preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $label) .'</a>';
+		echo '"';
+		if ( !empty($class) )
+			echo ' class="'. $class . '"';
+		echo '>'. preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $label) .'</a>';
 	}
 }