You should return to the U.S. and apply for a Re-entry Permit. The application must be filed from within the U.S. It is also important to establish some ties with the U.S. (e.g. have a bank account, apply for and renew driver license, file your taxes) The Re-entry Permit will allow you to return to the U.S. as a permanent resident after a period of up to two years.
Answered on Jul 18th, 2011 at 2:40 PM