Setting up a specific page length in printer

Hi,

I have a requirement of setting up a specific page length in printer and found the below SDN link, it says to setup code in 'Printer initialization' in device type for that page format:

http://wiki.scn.sap.com/wiki/display/Snippets/Creating+custom+page+format+in+Smartforms+and+Sap+scripts

Can some one help what code we need to add here to set up specific page length?

Regards,
Jitendra Singh