Client File IO

Hello every one
I am working on a web-based proxy using GWT (similar to php proxy)
anyway , the idea is quite simple
Get the URL from the user , make the server fetch it , change the
HTML and send it back to the client
Now I have encountered a problem which is how to send the images back
to the client?
I have thought of two possible ways:
1-Store them in the server and change their src to MyURL/img.xxx
2-Send them back to the client
The first option will over load the server (I think?!)
The second option is not possible because as far as I know it is not
possible to do File IO in the client side , or is it?
I need your help
Thank you very much
ps: I think I will get a similar problem with flash , (e.g. flash
videos in youtube)

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