If all computers have access to the internet, then there are many image hosting sites available.
A couple that come to mind are ImageShack and Photobucket. They each let you register an account and you can upload images to them. Ohh, and not to forget Flickr.
I am unaware if any of them have editing options, and the only "Image hosting and editing" site I could find in Google was http://www.drpic.com/ but I don't know anything about that.
But I still think it is more preferable to access your image online with any computer, then "Download it", edit it as you wish with the tools you already have, then upload it again. Downloading takes seconds, uploading a little longer maybe.
Hope that helps.
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