gistfile1.php

// jon.posterous.com
// adds current class to archives link
add_filter( "get_archives_link", "customarchives_link");

function customarchives_link( $x )
{
	$url = preg_match('@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.-]*(\?\S+)?)?)?)@i', $x, $matches);
	
	return $matches[4] == $_SERVER['REQUEST_URI'] ? preg_replace('@<li@', '<li class="current_page_item"', $x) : $x;
}