RATIONALE: Drugs used in chemotherapy, such as temozolomide, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Radiation therapy uses high-energy x-rays to kill tumor cells. Vatalanib may stop the growth of tumor cells by blocking blood flow to the tumor. Giving temozolomide and radiation therapy together with vatalanib may kill more tumor cells.