I just joined in and have come across this situation before. First determine if the control you will jump from has changed:

llRetVal = (EVAL(oForm.ActiveControl.ControlSource) = oForm.ActiveControl.Value)

or

(VAL(GETFLDSTATE(-1)) % VAL(REPLICATE("3", LEN(GETFLDSTATE(-1))))) = 0

Run something like this in the Valid. The return value should tell you where you need to go (.f. {user has made a change} = jump to the next page).