var max = 4;

var nrImages = 4;

function makeImages() {

this[0] = "http://afiliados.cliquemidia.com/banners/728x90-4.gif";
this[1] = "http://afiliados.cliquemidia.com/banners/banner_728x90.gif";

this[2] = "http://afiliados.cliquemidia.com/banners/jogo_728x90b.gif";
this[3] = "http://ads2.gamavirtual.com/banners/futebolquiz_728X90.gif";




this.length = nrImages;

}



function makeLinks() {

this[0] = "http://afiliados.cliquemidia.com/pub.php?id=814_97_bid_556";

this[1] = "http://afiliados.cliquemidia.com/pub.php?id=814_49_bid_561";

this[2] = "http://afiliados.cliquemidia.com/pub.php?id=814_48_bid_550";
this[3] = "http://afiliados.cliquemidia.com/pub.php?id=814_77";




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("<a href="+vetLinks[cont-1]+" target=_blank><img src="+vetImages[cont-1]+" border=0></a>");
break;
}
}