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the simplest thing is to add an onChange event to your select element
which will relocate the user to the next page, passing selected value as
the above will take the user to nextpage.cfm?cat=[value of selected
option]. so on the nextpage.cfm query your db to get the subcategories
that belong to #url.cat# category.
there are other, more complicated ways to do it: you may want to google
"two selects related", which will show you how to populate a second
select element on the same page based on selection in the first select
Make sure you indentify yourself on the page with the form so that any keyboard users can hunt you down and shoot you for building such a user unfreindly app.