Page down on iPad using apple bluetooth keyboard

I have an un-jailbroken iPad 2 and an apple bluetooth keyboard. They work great together for typing, and I appreciate the function keys up top. I'm wondering if there is any way to use the keyboard to trigger the page down action? When I am reading a long webpage on the computer, I use the down arrow or the spacebar to go down, and I was hoping there was something similar that I'm missing on the iPad. Thanks for your help!