Help with is_member_of condition

[misterfade]

I have a custom table setup called 'sellers' and I want to query that table to get all the userid's from there, then match it with the userid's in the vbulletin user table, then see if they're part of specific usergroups.

I figure the easiest option would be to get the sellers userid's and then use it in a loop with is_member_of but what would be the correct syntax?

All I know is the basic:

PHP Code:

is_member_of($vbulletin->userinfo, 1, 2, 3) 


Any help would be appreciated. Thanks.