Can I print to different paper sizes with AirPrint and Safari?

I am the organizer of a trade show coming up.

We are using a web based registration system for attendees.

To print the attendee badges, we simply log in to the site through the net, and print them. I have an HP CP1525nw loaded with 3x5 index cards that will slide into the badge holders.

When printing from the Mac, I simply go to Page Setup, set the paper size and orientation and print. It works great.

However, we would love to use iPads for our registration staff. Not only are they less expensive, but they are portable, and totally wireless. We can access the site just fine, and the badges show great on the screen. The website generates the badges as a .pdf file and they load into the browser.

When printing from the iPad, the badges print HUGE, filling an entire 8.5x11 size page. With the 3x5 card stock loaded in the paper tray, they still print huge, only showing the portion of the badge on the 3x5 card in the location it would be had there been letter size paper in the tray.

Any ideas?

I've considered formatting another badge for letter size, and having it print only where the 3x5 card would fall... but that is a huge tweak that I think should be unnecessary.

How do I print to different size paper from my iPad?

Thanks for the help in advance.

--Brian