var bfull = new makeArray(6);
bfull[0] = "<img src='images/capa.jpg' width='456' height='260'>";
bfull[1] = "<img src='images/capa1.jpg' width='456' height='260'>";
bfull[2] = "<img src='images/capa2.jpg' width='456' height='260'>";
bfull[3] = "<img src='images/capa3.jpg' width='456' height='260'>";
bfull[4] = "<img src='images/capa4.jpg' width='456' height='260'>";
bfull[5] = "<img src='images/capa5.jpg' width='456' height='260'>";

// document.write(imagenslib[rand(imagenslib.lenght)]);
document.write(bfull[rand(bfull.lenght)]);