Yo can do various things like form#foo p, input {display:none;} etc etc.. You can be very very selective on what prints and what does not. So if I understand correctly you are getting empty white space above or below your content when print preview is activated? Post a url etc so I can take a look.

BTW:

form#foo p, input {display:none;} would do this: hide any form with the id of foo and subsquently it's paragraphs if any and any inputs.

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I hate IE 6. Just sayin....