Cisplatin, Fluorouracil, Iressa, and Radiation Therapy Patients With Locally Advanced Head and Neck Cancer

head and neck cancer, stage iii squamous cell carcinoma of the hypopharynx, stage iv squamous cell carcinoma of the hypopharynx, stage iii squamous cell carcinoma of the larynx, stage iv squamous cell carcinoma of the larynx, stage iii squamous cell carcinoma of the lip and oral cavity, stage iv squamous cell carcinoma of the lip and oral cavity, stage iii squamous cell carcinoma of the oropharynx, stage iv squamous cell carcinoma of the oropharynx, interventional, phase1, phase2