Print From Your Computer : Macintosh Printing (Mac OS X 10.3 and 10.4)

Select Page Options
Open the Page Setup window to select your page options.
Open the File menu and select Page Setup.
Select the Paper Size setting for the paper you loaded. A Custom option is also available so you can create a custom size (in OS X 10.3.9, select Custom Paper Size from the Settings pop-up menu).
If you want to print a borderless photo, select the paper size with a Sheet Feeder - Borderless option.
For borderless photos, make sure you loaded a compatible borderless paper size and type.
Choose a portrait or landscape Orientation option for your document or photo. (Choose  landscape left for envelopes.)
Click OK to close the Page Setup window.
Now you can select your print settings and print.