There are command line image resizers (too many to list here) and a script that could take this down to one click.
Your first year programmer should be able to do this for you.
Bob
Hi,
I'm looking for a program that will re-size one or more images into different dimensions (by one-click), such as:
1920x1200, 1600x1200, 1024x768 etc.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic