I need a 'good password' validation routine.

I'm looking for a simple function or so that will tell a user if they have a "safer" password. Ideally it would check that they used letters & numbers, upper/lower case, and mebbe at least one punctuation character. This can be in JavaScript too if you don't have a PHP version. In fact JS is almost preferred since that's how I validate a lot of the other fields. Either way. I just want to avoid passwords like "pass1" and "secret" and "daevid"...