Wordpress Single PHP theme based on category

single.php

<?php
/*
Template Name: Single News
*/
?>
<?php
// Switching if projects or if news
$proj='projects';
$catid=-1;
foreach(get_categories() as $category)
{
  if($category->name==$proj or $category->slug==$proj)
  { 
        $catid = $category->cat_ID;
        break;
  }
}

if (in_category($catid) && $catid!=-1) 
{
  include (TEMPLATEPATH . '/single-projects.php');
}
else 
{ 
  include (TEMPLATEPATH . '/single-news.php');
}
?>