Place your chips on either red, black, odd, even, or at some tables the first range of
numbers (1-18) or the second (19-36). If you place one of these bets you must bet the
table minimum. You may also make an inside bet which is a bet on specific numbers or
combinations of numbers. By placing an inside bet then your bet must total five dollars,
meaning you could several lower bets on different numbers. Winners are determined by
where the ball lands.
source:
http://marxthespot.com/~aaron/online_roulette/casino_roulette.html