Radiation Therapy and Chemotherapy Following Surgery in Treating Patients With Stage II or Stage III Bladder Cancer

RATIONALE: Radiation therapy uses high-energy x-rays to damage tumor cells. Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining more than one drug and combining radiation therapy with chemotherapy may kill more tumor cells. PURPOSE: Phase II trial to study the effectiveness of radiation therapy combined with fluorouracil and cisplatin in treating patients who have stage II or stage III bladder cancer, and who have undergone transurethral resection.