a. you probably need to ask this in an Access group.
b. I'm not that familiar with Access, but when I started a copy of Access 97
here I couldn't see any obvious facility to do this in either the "Table
Datasheet" toolbar or the "Formatting (Datasheet) toolbar, which suggests to
me that you might have done some additional configuration in your copy of
Access 97 or perhaps installed some addin that helps you to do this. If so,
the chances are that the same thing will work in Access 2003, if only you
can remember what it is :-)

Just my 2-cents' worth

Peter Jamieson