If you do manage to come up with the money to pay the interest it is probably not the best thing to do. The interest on the Stafford loan is not compounded, but rather capitalized. This means that the interest is not added to the principal until you go into repayment, i.e. once you finish school in four years.
It would be better (provided you have the self-restraint to do it) to place the money that would be used to pay interest on the Stafford loan in some income-bearing account (money market, CD's, etc.). Then you can pay all the interest that has accrued on the loan while you are in school at one time, just before it is capitalized.
Once that interest is capitalized, you will be paying interest on the interest.