var imm = new Array();
imm[0] = "images/bp/scambio.png"
imm[1] = "images/bp/logoianusanim.gif";
imm[2] = "images/bp/aeritel.jpg";
imm[3] = "images/bp/telescopedoctor.gif";
imm[4] = "images/bp/m42.jpg";
imm[5] = "images/bp/astrominturno.jpg";

var lnk = new Array();
lnk[0] = "http://www.negozitelescopi.it/segnala.html";
lnk[1] = "http://www.ianussrl.it/";
lnk[2] = "http://www.aeritel.com/";
lnk[3] = "http://www.telescopedoctor.com/";
lnk[4] = "http://www.m42.it/";
lnk[5] = "http://www.astrominturno.it/";

var x = 0;

var mostra = document.getElementById("banner");

function mostra_banner()
{
    mostra.innerHTML = "<a href='" + lnk[x]  + "'><img src='" + imm[x] + "'></a>";
    window.setTimeout("mostra_banner()", 4000);
    x = Math.floor((imm.length) * Math.random());
}