In this study, chemotherapy will be given initially (induction therapy) to try to control the spread of the cancer. Then radiation and chemotherapy will be given together. Receiving chemotherapy at the same time as radiation treatments can enhance the effect of the radiation. In this study, patients will receive a drug called ZD1839. In laboratory tests on cancer cells, ZD1839 has shown an additive effect when used in combination with radiation. ZD1839 has also been shown to slow or stop growth in tumors.