What website can you change photos digital background with out having to download it and have it be easy?

please hellp i want to change my pictures background to something vaction like, but the backgrounds something as tipicial as a bathroom mirror shot . how can i go about changing it easy without DOWNLOADS, because my computer wont let me download anything %26amp;%26amp; please make it easy ive been trying to look for like 4 hours now? no luck : (What website can you change photos digital background with out having to download it and have it be easy?http://www.picnik.com/

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