LOUISVILLE, Ky. (AP) -- There's a lot of dough in online pizza. Just ask the Papa John's people.

The chain has just passed the 1-billion-dollar mark in Internet pizza sales. The company says Internet orders have climbed more than 50 percent a year since the service started seven years ago. The hottest markets for Papa John's Internet orders are the Austin, Texas, and Washington D.C. areas.

A company official says while it took seven years to reach that first billion-dollar plateau, forecasts indicate it will take fewer than three years to hit the next billion.

Officials of Papa John's promise new wrinkles to high-tech ordering, but they're not revealing just what's in the oven.