var max = 2;
var nrImages = 2;
function makeImages() {
this[0] = "http://www.galeriasxxx.xpg.com.br/gostosa1.jpg";
this[1] = "http://www.galeriasxxx.xpg.com.br/gostosa2.jpg";

this.length = nrImages;
}

function makeLinks() {
this[0] = "http://www.xclicks.net/sc/out.php?s=6334&ct=sex";
this[1] = "http://www.xclicks.net/sc/out.php?s=6334&ct=vip";

this.length = nrImages;
}

var vetImages = new makeImages();
var vetLinks = new makeLinks();
var x = Math.round(Math.random()*max);
var y = max / nrImages;
for(var cont = 1;cont*y<= max;cont++) {
if (x <= (cont*y)) {
document.write("<center><a href="+vetLinks[cont-1]+" target=_blank><img src="+vetImages[cont-1]+" border=0></a></center>");

break;
}
}