var imm = new Array();
imm[0] = "banner/468x60.jpg";
imm[1] = "banner/MC468x60.jpg";
imm[2] = "banner/directory468x60.jpg";
imm[3] = "banner/wl468x60.gif";

var lnk = new Array();
lnk[0] = "http://autoaiuto-community.org/";
lnk[1] = "http://www.mentecritica.net";
lnk[2] = "http://directory.autoaiuto-community.org/";
lnk[3] = "http://www.web-link.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()", 5000);
    x = Math.floor((imm.length) * Math.random());
}