var bannerd = new Array();
bannerd[0] = "<iframe src='http://www.vitos.it/giroban/loghi0.htm' name='neobux' marginwidth=0px marginheight=0px align='left' width=468 height=60 frameborder='0' scrolling=no>";
bannerd[1] = "<iframe src='http://www.vitos.it/giroban/loghi1.htm' name='6441653C821616936' marginwidth=0px marginheight=0px align='left' width=468 height=60 frameborder='0' scrolling=no>";
bannerd[2] = "<iframe src='http://www.vitos.it/giroban/loghi2.htm' name='neobux' marginwidth=0px marginheight=0px align='left' width=468 height=60 frameborder='0' scrolling=no>";
id = Math.floor(Math.random() * (1+1))

//id = Math.random() * 11); //ne prende una a caso
document.write( bannerd[id] + "</iframe>");