Automatic sizing for image levels.

I am building a new site for a non-profit using FAIRFIELD. They have all their race sponsor logos organized by size (more money donated = bigger logo). Is there a way to ensure that anyone working on the site can simply upload a photo in the correct section and have it resize to match the other images?

Here is old site for reference: http://www.perseverancetrailrun.com/our-race-sponsors

Thanks for your help.

CheersArran