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It might be easier to use ajax actually, because you could load the first drop-down with the default values. Then you'd make an ajax call to your code behind language, it would then filter the results for you, then you can pass it back through an ajax response as an array. You create another drop down and load it with the results stored in the array. Then you do the same thing for a third box.
It just gets sort of messy when you are dealing with several cascading dropdowns, you might be able to find something easier by using that search term "cascading dropdowns".
What programming languages do you use Katana? jQuery (a javascript library) makes it really easy to do ajax stuff.
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