adding a new single post page layout with new posttype

Hi,

I created a new posttype called “offers”

I added a new function to functions.php:

add_filter('single_template', create_function(
	'$the_template',
	'foreach( (array) get_the_category() as $cat ) {
		if (file_exists("/single-{$cat->slug}.php") )
		return "/single-{$cat->slug}.php"; }
	return $the_template;' )
);

I created a new file called single-offers.php
This page is the same as single.php only changed the line:

get_template_part( 'includes/loop', 'index' );
to
get_template_part( 'includes/loop', 'aanbieding' );

I created a new file called loop-offer.php t
and pasted the same code as in loop-index.php in there.
All is working perfect except.

I want to edit the list overview of posts seperate from the single view of a post.

Please help me out here.

thanks

fabian