Fix repeated page names on sidebar

Check if page already appears in sidebar.  If so, continue the loop

modules/extra-sidebar.php

@@ -100,7 +100,10 @@ function render_sidebar($pageindex, $root_pagename = "")
 		// The current page is the same as the root page, skip it
 		if($pagename == $root_pagename)
 			continue;
-		
+
+		// If the page already appears on the sidebar, skip it
+		if(preg_match("/>$pagename<\a>/m",$result)===1)
+			continue;		
 		
 		// If the part of the current pagename that comes after the root
 		// pagename has a slash in it, skip it as it is a sub-sub page.