use keyboard to move div?

Alright, so I'm trying to make a simple script that moves down a div when I press 's' but it's not firing at all. Can someone tell me what I'm doing wrong?

http://prime.p开发者_StackOverflow中文版rogramming-designs.com/designs/map/

---

$ is not defined http://prime.programming-designs.com/designs/map/ Line 28 Have you included jQuery or Prototype BEFORE your own script?