Stupid newbie looping MySQL question

What I want to do: 1) First, pull a list of topics from one table; 2) Then, use each topic one by one to pull info from *another* table; 3) Once I have that info, process *it* piece by piece. I've tried a few things, and I've looked at my books and the manual, but PHP keeps telling me the supplied argument is not a valid MySQL resource, and I confess that I'm not entirely sure what I'm doing yet. :) Thanks in advance. Lynn -- Lynn Siprelle, Siprelle & Associates: Web Construction and Publishing Chief Assoc. Josephine b. 9/9/97 * New Assoc. Louisa due 5/1/01 Business: lynn@siprelle com | Personal: lynsa@siprelle.com The New Homemaker: http://www.newhomemaker.com/