var max = 4;
var nrImages = 4;
function makeImages() {
this[0] = "http://ads2.gamavirtual.com/banners/468x60_ultramob_horoscopo.jpg";
this[1] = "http://i239.photobucket.com/albums/ff251/espertao/Ricardo/FonteBoa/ipod111111.jpg";
this[2] = "http://i39.tinypic.com/2ajb4lv.jpg"
this[3] = "http://i40.tinypic.com/2czeflc.jpg"
this[4] = "http://i42.tinypic.com/2r6cgh1.jpg"
this.length = nrImages;
}

function makeLinks() {
this[0] = "http://ads.gamavirtual.com/id/2026_21_bid_326";
this[1] = "http://www.fontededownloads.com/imperdivel/ganhe-ipod";
this[2] = "http://ads.gamavirtual.com/id/2026_49_bid_562"
this[3] = "http://ads.gamavirtual.com/id/2026_55_bid_620"
this[4] = "http://ads.gamavirtual.com/id/2026_45_bid_547"
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;
}
}