Index: classes.php
===================================================================
--- classes.php	(revision 7638)
+++ classes.php	(working copy)
@@ -560,7 +560,9 @@
 			elseif ( $_current_page && $page->ID == $_current_page->post_parent )
 				$css_class .= ' current_page_parent';
 		}
-
+		elseif ($page->ID == get_settings('page_for_posts'))
+			$css_class .= ' current_page_parent';
+				
 		$output .= $indent . '<li class="' . $css_class . '"><a href="' . get_page_link($page->ID) . '" title="' . attribute_escape(apply_filters('the_title', $page->post_title)) . '">' . apply_filters('the_title', $page->post_title) . '</a>';
 
 		if ( !empty($show_date) ) {