Static Page style sheets

I’m having some difficulty trying to call different style sheets for different individual static WordPress “Pages”.

I have this code in my header:

<style type="text/css" media="screen">
/* Calls the style sheets for each category */
<?php
$post = $wp_query->post;

if ( in_category('1') ) {
include(TEMPLATEPATH . '/assignments.css');

} elseif ( in_category('2') ) {
include(TEMPLATEPATH . '/television.css');

} elseif ( in_category('9') ) {
include(TEMPLATEPATH . '/workfromhome.css');

} elseif ( is_page('338') ) {
include(TEMPLATEPATH . '/television.css');

} elseif ( in_category('7') ) {
include(TEMPLATEPATH . '/clickables.css');

}

?>
</style>

That works for categories, but not for static pages. It used to though. Could this be permalink related?

thanks!