Access 97 Alternate Key Sequence ??

I have a form with several colums across and several rows down. I want to be able to move from one column in a row to the same column in the next row. I found that CTRL+ Page Down does the trick.
BUT the old DOS program which this one replaces used the Down Arrow Key, which seems much simpler.

Is there any way to tell Access to perform CTRL+PageDown when the DOWN ARROW key is pressed???

Thanks for your help......

Alan