Long domain names

Hi,

I've got URLs like this one: users.mem.domain.com . I've created a
virtualhost with the serveralias *.mem.domain.com . I want to map * to a
seperate dir. I've tried to use mod_vhosts, but it won't see the very
first part of it. And now I'm already ran out of ideas how to solve this.
Can anyone help me?

thanks in advanced,

Frank de Bot