The best way of doing it is with a decent photo editing program.

My favorite is Photoshop Elements, but I got an old version when it was cheap, and it's been "improved" now. New versions are a bit expensive. I'd still recommend it, if you might want to do anything other than extrememly simple stuff.

I'm not current on what freeware image editing programs are available now, but the basic answer is that you need an image editing program that lets you change the number of pixels in the image, and that can save as .jpg. Better programs let you choose how much compression to apply as well, but for web use you may be able to get by with one that uses a single compression amount.

The only things included in WinXP, so far as I've noticed, are the Windows Picture and Fax Viewer, which can't do any editing, and Paint, which allows limited cropping but can't change resolution - which is what you need.

There is one freeware program that I've seen that's an "almost copy" of Photoshop, that would be an excellent choice; but for some reason I'm not finding my notes on it, so I'll have to do some "exotic searching." Someone else may be able to recommend a favorite while we wait.

John