To add to Jack's comments, you can deduct gambling losses to the extent of winnings, but only as an itemized deduction.
On your tax return, you can deduct your total itemized deductions or the standard deduction, whichever is more beneficial. The common itemized deductions are property taxes, mortgage interest, charitable contributions (not donations to your bookie) and state taxes withheld. Gambling losses to the extent of winnings would also be an itemized deduction. If the itemized deductions, including your gambling losses, exceeds the standard deduction, you will get some tax benefit from deducting the losses.
In 2002, the standard deduction for married persons is $7,850 and for singles is $4,700. Check these numbers because they may have changed.