Where Clause on ID

Hello All,

I’m trying to make a listing on the single post view, that displays 4 older posts. Instead of ordering by date, I was thinking it might be quicker and easier to just filter with a WHERE statement on ID.

This doesn’t seem to work though, any ideas:

function filter_where( $where = '' ) {
	$where .= " AND ID < ".$post->ID;
	return $where;
}
add_filter( 'posts_where', 'filter_where' )
query_posts('posts_per_page=4&cat=11');

Thanks
Ian.