Accessing List Box On Same Page Before Submitting

My form contains a drop down list of univ. campuses and depending
upon the campus user is selecting, I am selecting the courses offered
in that campus from database (MS Acccess) and showing those in a
different drop down list below.

Is there any way that I can access that campus-list value before
submitting it to database?

Also, please give me solutions in VBScript and no javascript. That's my
Prof.s restriction. One of my friend told, there is no way this can be
done. But I am sure there must be some solution. Microsoft is not that less
creative.