Can anyone teach me how to play mahjong?

I mean the original mahjong, not that windows mahjong.

What's the difference?

Anyways: http://en.wikipedia.org/wiki/Mahjong

The Windows Mahjong is a patience game for one player using Mahjong tiles, while Mahjong itself is a wonderful game for 2 or 4 people with elements in common with dominoes (only much more depth).