This study will test the immune system response to and safety of two HIV vaccines alone and in combination: ALVAC-HIV (vCP1452) and LIPO-5. ALVAC-HIV (vCP1452) uses a canarypox virus with man-made parts of HIV attached to it. The canarypox virus cannot cause disease in people. LIPO-5 is a mixture of five man-made proteins similar to proteins found in HIV.