Is it possible to comapare values in two arrays??

I have two (turn) tables (and a microphone)... Just kidding... eh.... I have two tables containing information about email adresses, and userinfo. The first table is calles email and the other userinfo in the email table i sort all the adresses by type... (about 8 different types) And the user has the oppotunity to choose which types he needs to send an email to (this will be stored in the userinfo table) The point is that when the user clicks himself into the page where he can control who will be the receipients of his e-mail, all the types should be listed, and the ones stored in the userinfo table should be checked... This isn`t a critical function on this page, and I can do without it. But, this is the second time I run into this kind of problem, and I HAVE to find out how I can solve it!!! Could it be that I have a bad normalization of the db or something?? I don`t know.... Please help me!