How can I increase a JPEG size?

Hi I’m working in a PhotoSlideshow the one from “New from Template” and in the first step of “preparing your photos” I have to change the size of my photos from 352x288 to 640x480,
How can I do this and keep the same quality on the photos.

You can’t. Photoshop can do a pretty good job at that, but you’ll never have the same quality.

pom :asian: