How do you play jacks?

The game usually involved around four or more jacks. You would begin with all the jacks in your hand and then you would toss them up at the same time, and try to catch as many as you can on the back of your hand. Then however many are on the back of your hand is how many you start with. So say you caught two. You then start with two and throw them up, while picking another jack up, and have them both land on the back of your hand. And if you do, you continue until one less jack falls off your hand.