Microsoft Word - printing multiple postcards on one 8 1/2 X 11 card stock sheet

Hi All:

I am new to this message board - your assistance is greatly appreciated. 

I am trying to print landscape postcards - four per page (using an avery product #8577) but, the orientation of the postcard stock is "portrait".  Is there a way to print four postcards to this type of paper?

I have Vista Home and Word 2007.

Thank you,

Christina