Can I change page layout when using window.print()?

Question

In our application we enable users to print pages. We do this by supplying a button which when click calls the window.print() function.
Some of the pages would look better i

Answer 1

You should use a print stylesheet.

More info...

How to print only parts of a page?

Edit: to coerce landscape orientation, apparently the standard is size: landscape, but I have no idea how well that's supported across browsers.