Super-Simplistic Definitions:

POT ODDS =
$-In-The-Pot / $-To-Call-The-Bet.

IMPLIED ODDS =
$-In-Your-Opponent's-Stack / $-To-Call-The-Bet.

This is over-simplistic because there are other factors you have to consider before calling with Implied-Odd. But basically if you look at the pot and decide it's right to call the bet, that's pot-odds. If you look at the stack sizes and decide it's right to call the bet, that's Implied-odds.

EasyT.