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One way to print a banner is to use the
free app Tiler. After you save your Pages file to PDF, here's what it does:
"Print a single PDF page using multiple sheets of paper to create large banners and posters. Independently scale and center each page in a PDF document as you add or remove rows and columns. Visually preview results in the workspace before printing."
You can download it at
http://www.mindcad.com/tiler.html
Walt