<!-- Begin
var how_many_ads = 4;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;

if (ad==1) {
txt=""; 
url="http://clk.tradedoubler.com/click?p=17460&a=158744&g=137726";
alt="Casa del Libro";
banner="http://impes.tradedoubler.com/imp/img/137726/158744";
width="120";
height="60";
}
if (ad==2) {
txt=""; 
url="http://tracker.tradedoubler.com/click?p=15853&a=158744";
alt="Pixmanía";
banner="banners/pixmania120x60_es.gif";
width="120";
height="60";
}
if (ad==3) {
txt=""; 
url="http://clk.tradedoubler.com/click?p=4326&a=158744&g=697555";
alt="Dell Computers";
banner="http://impes.tradedoubler.com/imp/img/697555/158744";
width="120";
height="60";
}
if (ad==4) {
txt=""; 
url="http://ad.zanox.com/ppc/?1564652C975302034T";
alt="Sol Meliá";
banner="http://ad.zanox.com/ppv/?1564652C975302034";
width="120";
height="60";
}

document.write('<center>');
//document.write( txt + '<br>' );
if (tarjeta=="si") {
	document.write('<a href=\"' + url + '\" target=\"_blank\">');
}
else {
	document.write('<a href=\"' + url + '\">');
}	
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0><br></a>');
document.write('</center>');
// End -->