[Plugin: WP e-Commerce] Problem with wpsc_is_in_category conditional tag

Hi I have a problem with wpsc_is_in_category tag.

In a sidebar I want to display list of categories depending on the category page the user is on.

So I have a code like this:

<?php if (wpsc_is_in_category() ==8) {
echo 'example 1';
} elseif (wpsc_is_in_category() == 17)  {
echo 'example 2';
} elseif (wpsc_is_in_category() == 17)  {
echo 'example 3';
} else {
}
?>

The tag doesn’t work, all I get on each category page is ‘example 1’ displaying.

Is there another way to do it?

http://wordpress.org/extend/plugins/wp-e-commerce/