WP custom post_type & taxonomy

function customPostType($posttype, $name, $tax, $supports) {
	$labels = array(
		'name' => _x($name, 'post type general name'),
		'singular_name' => _x($name, 'post type singular name'),
		'add_new' => _x('Add New', strtolower($name) . ' item'),
		'add_new_item' => __('Add New ' . $name),
		'edit_item' => __('Edit ' . $name),
		'new_item' => __('New ' . $name),
		'view_item' => __('View ' . $name),
		'search_items' => __('Search ' . $name),
		'not_found' =>  __('Nothing found'),
		'not_found_in_trash' => __('Nothing found in Trash'),
		'parent_item_colon' => ''
	);
 
	$rewrite = false;
	if($posttype=='collections' || $posttype=='agency') $rewrite = array('with_front'=>false);
	$args = array(
		'labels' => $labels,
		'public' => true,
		'publicly_queryable' => true,
		'show_ui' => true,
		'query_var' => true,
		//'menu_icon' => get_stylesheet_directory_uri() . '/article16.png',
		'rewrite' => $rewrite,
		'capability_type' => 'page',
		'hierarchical' => true,
		'menu_position' => null,
		'supports' => $supports
	  );
 
	register_post_type($posttype,$args);
}
 
function customTaxonomy($name, $query_var, $slug, $label, $posttype, $singular) {
	register_taxonomy($name, $posttype, array(	"hierarchical" => true, 
							"label" => $label, 
							"singular_label" => $singular, 
							"query_var" => $query_var, 
							"rewrite" => false
						));
}