JavaScript Question

Hi, all;
I have a <select><option> pulldown menu of car makes and one of car makes 
*and* models. I would like to substitute *just* the models for the latter 
*if* the user enters a make into the first field. If the user *doesn't* 
enter a make, then the user would pulldown the original make *and* model 
menu. Okay, this could be done through JavaScript, but is it possible 
without the user hitting a *submit* button? The user will hit two pulldown 
menu buttons before the database must be changed. TIA,
BenO

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