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you need to check out the SmartProfiles module (I'm assuming you're using 2.0.x). This allows for you to do that. It's the SmartFactory version of the profiles module that was added to the 2.2.x fork.
There is a learning curve to it, a couple of errors, and such. However, it does what you need, generally. It also requires PHP5, although you can find a version for PHP4 (and I'm about to release a version for PHP4 (or 5) that is "cloned" (moved?) to the "profile" directory ala 2.2.x so that it is compatible with xosCommerce 0.62) but I found it a little buggy as well. I think there are some other PHP dependencies, but with a little work, you'll make it go.
Otherwise, you need to go into hacking big time. Or hack the Profiles + Photo Hack. Or wait for XOOPS 4 XOOSPHERE (but don't hold your breath). This is one of those long-time things awaiting for XOOPS.