Subcategory menu dependent on topcategory

[dickreuter]

I'd like to create two dropdown menus, one where the user can select a topcategory and depending on what he selects the subcategory menu should contain certain values, which should immediately be updated once the user has selected the top category. Any advice what the best way is to tackle this problem?

Any help is much appreciated.
Nicolas

[leatherback]

Have a look at javascript OnChange functions, and or AJAX