Logging question

Currently I'm using the mysql logging functions of FreeRADIUS and I'm logging two different things: Dial-up customers that log in with just their username (username) DSL Customers that log in with user at domain (username@domain.com) I'm wondering, how would I get it so that both log the same way, that is, just username, not the suffix @itol.com. Any advice would be great! Thanks, Curt LeCaptain