two categories

Hey there,
Sometimes I would like to post something which fits into 2 categories and when I do, i simply check the categoryboxes. But when it’s published it looks odd. There is no sort of separator between the categories such as and, , or |. Im sure it can be done, but how ?
Regards,
Koads
http://zen.mmedu.net/~koads/luma