function ShowBanner() {
    var NB = 3;
    var HREF = new Array;
    HREF[1] = 'carta_credito.asp';
    HREF[2] = 'omaggi_weekend.asp';
    HREF[3] = 'cliente_gold.asp';

    //---------------------------------------------------------------------------------------------------    
    
    var n = Math.floor(Math.random() * 100) + 1;
    n = (n % NB) + 1;
    var div = document.getElementById("header_logo");
    var href = HREF[n];
    var html= '<div class="SX"><a href="home.asp"><img src="images/1.jpg" alt="Logo Piram" /></a><div class="promotion"><a href="catalogo.asp?RISUL_New=y&Ramo=1&Cat1ID=363"><img src="images/pulsante_festa_papa.jpg" /></a></div></div>';
    html = html + '<div class="DX">';
    if ( href != '' ) html = html + '<a href="' + href + '">';
    html = html + '<img src="banner/banner' + n + '.jpg">';
    if ( href != '' ) html = html + '</a>';
    html = html + '</div>';
    div.innerHTML = html;
}