Where to save temporary internet files

I have a web site using javascript, perl, and php. I generate a graph that uses flash technology. I want to put this graph into a pdf file with other text and allow the end user to print it out. I can save the generated flash graph as a jpeg file. I can pull a graphic into the pdf file. What I don't know is where to save the graphic file. I would like to save the file on the client side. That way I don't need to worry about unique naming conventions and keeping track of numerous files. Client side I can just call the graphic the same thing each time and reference it by just one name for everyone. Is there a simple way to save this for all operating systems? I am thinking maybe the temporary internet file directory - if I am allowed to do such a thing - but I don't know how to do this. Or maybe there id a better solution for doing this?
pconderAsked:
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Michel PlungjanConnect With a Mentor IT ExpertCommented:
So the answer is correct: You can't do that

Actually you might be able to save an image < 4k b64 encoded in a cookie in firefox and use the data parameter in the image tag
It will not work in any browser that does not support the data parameter.
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Michel PlungjanIT ExpertCommented:
You cannot include a file from the file system just like that. It is not allowed from a security point of view
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