SU011248 in Advanced Hepatocellular Carcinoma

* Participants will be given a supply of SU011248 capsules to be taken orally every morning for 4 weeks. After taking SU011248 for 4 weeks, there will be a 2 week rest period when the participant will not take any capsules. This 6-week period is referred to as 1 cycle. * Participants will continue to receive SU011248 study treatment as long as their disease does not worsen significantly and they are not experiencing any serious side effects. * During cycle 1 of study treatment, the participant will come to the outpatient clinic once a week for blood work, physical examination and dynamic contrast enhanced magnetic resonance imaging (DCE-MRI), which is done two weeks after they start taking study treatment. * During cycle two and every cycle thereafter, the participant will be asked to come to the outpatient clinic once every two weeks for physical examination, blood work and urine tests. * A CT scan or MRI scan to assess the tumor will be performed once during each cycle for the first three cycles, then once every 2 cycles thereafter. ACTH stimulation test will be done every 2 cycles. A MUGA scan may be done at anytime at the discretion of the the study doctor.