var max = 10;
var nrImages = 3;
function makeImages() {
this[0] = "/Style%20Library/Tributo_ao_Futuro/imagens/banners/banner_tributo_ao_futuro_01.jpg";
this[1] = "/Style%20Library/Tributo_ao_Futuro/imagens/banners/banner_tributo_ao_futuro_02.jpg";
this[2] = "/Style%20Library/Tributo_ao_Futuro/imagens/banners/banner_tributo_ao_futuro_03.jpg";

this.length = nrImages;
}
function makeLinks() {
this[0] = "/";
this[1] = "/";
this[2] = "/";

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