This will fetch the id of the category you are in (assuming this is a category archive listing page):
<? global $cache_categories;
$category_id = 1; // sensible default for me
foreach ($cache_categories as $cat) {
if (strcmp($cat->cat_name, $category_name) == 0) {
$category_id = $cat->cat_ID;
break;
}
}
?>
