 Randomized study with five groups to receive one of the following vaccination regimens: One of the three formulations of GSK Biologicals Hib-MenAC mixed with GSK Biologicals TritanrixTM-HepB 3 different groups GSK Biologicals TritanrixTM-HepB GSK Biologicals HiberixTM GSK Biologicals TritanrixTM-HepB mixed with GSK Biologicals HiberixTM Wyeth Lederles MeningitecTM 