I had a client complain about the same thing. I produced PDFs for printing and also links to Word docs, but he wasn't happy. He simply wanted to print from the screen. As did you, I explained the technicalities of printing a web page to no avail. Finally, I simply made the damn page to fit HIS browser so HE could print it. He was then satisfied.

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DrTandem's San Diego Web Page Design, drtandem.com