I'm building a "contact us" form, with different options available via dropdowns, and when someone chooses a dropdown, I want certain information and options on the page to change according to what they have chose (and if they decide to pick something else, I want it to change again, accordingly). I'm trying to avoid using client-side JS as much as possible because of the problems that occur if users have JS disabled, etc...
Could someone point me in the right general direction for this? I don't even know if it's possible. I've tried Googling around for examples, but the ones I've found so far all use JS to do what I'm trying to do.