You never need to include the tags in any code you are generating.
See frank18's post #5, and adjust the if test for the category:
/includes/templates/YOUR_TEMPLATE/common/html_header.php and insert this piece of code just before the </head> tag:
PHP Code:
<?php
if ($current_page_base == 'index' and $_GET['cPath'] == 'your_cat_cPath'){
?>

[script code]

<?php } ?>
You would put the empty div he mentions into your category's description.