Browser Based Graphic Editor

Hi Guys,

I think that this would be a server side application so I threw it in here. I am looking for a browser based graphic editing application for a website. I would like to have a website where visitors could create graphics and post them to pages, or upload graphics/images, modify them and then post them. It does not have to be any super fancy program, it can be as simple as MS paint. They key is that it is an application/program that I can have on my website for them to use.

I was wondering if there is anything out there (free or commercial, or both) like this or if I am better off recommending that they use what they have on their desktop to create/modify the images and then have them upload them. Thanks guys!