Dependent Select Boxes in profile?

[CroNiX]

What would be the easiest way to add dependent select boxes to the profile? For example, 2 select boxes. One is state, the other is city. When you select the state in the state field, the city select box gets populated with cities based on the selected state. I can do this easy in regular php/html/javascript, but how would this be possible in vb4? Ajax possibly? I just haven't coded enough using vb's native methods in v4 to know enough yet.

Thanks!