For this protocol, radiation will be administered using a schedule which is more convenient for patients, by once weekly chest irradiation for a total of 12 weeks. Use of this schedule was determined to be as good as the more commonly used daily radiotherapy. The once weekly schedule is less cumbersome as it involves less visits. The rationale and reason why you are being asked to participate in this program is to study whether the drug Navelbine can be given together with the once weekly radiation schedule. Radiation will be administered in two fractions, 6 hours apart on one day. For this program, the drug Navelbine would be made available as a pill, and would not have to be infused through the vein. The proposed protocol will use increasing doses of the drug Navelbine in pill form to find the highest dose of Navelbine that is tolerated in conjunction with radiation therapy. Initially, each subject will receive one dose of Navelbine, which is higher than the dose of the previous subject. This escalation will continue until the highest tolerated dose has been determined.