form reload

iwant as soon as my user selects a value from a combo box my form to reload

ie
i have 3 combo boxes

Please Select Company to create a new user for:

then user selects company and as soon as the user selects company i want my form to reload with the
company managers names in the second combo box

Please Select managers name to create a new user for

then user selects managers name and then the form reloads
and then i can create the user under that managers name ???


anyone??

How are you storing the lists of data?
In a Database or hardcoded.

You've giot two options really,
either post the selected item in the first select box back to the server and re-queary the database using the data posted back as a key.

the other option is to load all the data into a client-side javascript.

Here's an example of what I mean
http://www.parkers.co.uk/pricing/used_car/index2.asp

The first method is simpler but slower