I could be wrong, but I don't know of any way to change the printing properties. Those are 'settings' on the user's computer that you're not supposed to be able to change.
You can search the "old forum" (see upper right corner of page) for "print landscape" to see if you can find any decent information on the subject.
"In the End, we will remember not the words of our enemies, but the silence of our friends."
- Martin Luther King Jr. (1929-1968)