Thanks very much - that fixed the problem.
I also have another question relating to one of the other pages created by the wizard if that's ok. The wizard created a search page that allows you to search by typing in the name of the subcategory and then choosing a category from a select menu. The search works correctly by returning the results to the Subcat_Results.php page, but it actually creates a problem when returning to the results page. To explain:
I have a subcategories menu item which when clicked links to the results page, (Subcats_Results.php) which is supposed to list all of the subcategories in the database, however if a search is done on the search page prior to clicking this menu item, the page displays the results of the previous search and not the entire subcategory list as it's supposed to.
Is there a way to modify this so that whenever the subcategories menu item is clicked, it always returns the full list?