var max = 1;
var nrImages = 1;
function makeImages() {
this[0] = "https://lh6.googleusercontent.com/-_f5py02S05o/Ts1QEVoj-HI/AAAAAAAAPKM/8JNpuxZZ8bY/s468/CameraHOT468x170.jpg";

this.length = nrImages;
}

function makeLinks() {
this[0] = "http://www.camerahot.com.br/?utm_source=Publicidade&utm_medium=banner&utm_term=Revista%2BFREE&utm_content=Topo&utm_campaign=Revista%2BFREE";

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;
}
}