It's also just called a fork, not a pair of forks. I second the suggestion to drop by a bike shop. Never hurts to get their advice. Also, you'll also need to install the headset's crown race onto the new fork, which requires a special tool.

Here are some more resources so you know just what you're getting into:

http://www.ehow.com/how_14185_install-new-bike.html
http://www.parktool.com/blog/repair-...gth-and-sizing
http://www.parktool.com/blog/repair-...eadset-service