var imm = new Array();
imm[0] = "banner/banner1.gif";
/*
imm[1] = "banner/banner2.gif";
imm[2] = "banner/banner3.gif";
*/
var lnk = new Array();
lnk[0] = "images/duomo.gif";
/*
lnk[1] = "http://pluto.disney.com/";
lnk[2] = "http://paperino.disney.com/";
*/
var x = 0;

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

function mostra_banner()
{
    mostra = document.getElementById("banner");
	mostra.innerHTML = "<a href='" + lnk[x]  + "' target='_blank'><img src='" + imm[x] + "' border='0'></a>";
    window.setTimeout("mostra_banner()", 5000);
    imm.length - 1 == x ? x = 0 : x++;
}