When are internet poker earnings taxable income?

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I know you have to pay taxes on poker earnings, but my question is when are those earnings really earnings. You play and win at an online poker site account and the earnings are put into that account when you leave the table. You withdraw the earnings from the poker site account into a neteller account. Then you withdraw earnings fron the neteller account into your local bank account. Right now I'm building up my bankroll so I'm leaving it in the neteller account. My thinking is that until the earnings have been deposited into my local bank account, they are not income. That is where I can get my hands on the earnings. Is this right? Or are they taxable when they are moved into the neteller account? Or are they taxable when they are in the poker site account? Thanks.