I guess I just underestimate photoshop's ability to create pixels out of nothing. I'm always so wary of increasing size and resolution beyond the original's when it doesn't look half-bad. Thanks again man!
Thanks for getting back to me so quick. I actually know my photoshop quite well. It's just that your results looked good enough that I wondered if you had done something special, some trick I didn't know about. Gracias de todas maneras!