Photoshop Levels Tutorial - Balancing Indoor/Outdoor Photos

Learned a new setting on my camera – white balance. But what about when you've got indoor and outdoor lighting in the same photo? I'm sure there's a "right way" to do it, maybe putting yellow filters on your indoor lights or something, but this video tutorial looks more like what I'd actually end up doing, especially since most of my photos end up on the web at low resolution.