Dynamically created dropdowns

Hope this isn't an inappropriate message to send to this list. I suspect the response will largely concern JavaScript. Is there a way of altering the contents of one drop down menu according to the item selected in another? I'm creating a page allowing users to identify the make and model of computers received by our charity for refurbishment. Ideally I'd like to allow them to select a manufacturer from a drop down menu and for a separate drop down menu to then be populated by the models produced by that manufacturer. I have two separate tables in a MySQL database, one for manufacturers and one for models with the latter containing a field for the manufacturer ID. Is this possible? Michael Egan