function top100_btn (top100usrid) {
}
var url_top = "http://www.top100-solar.it";
// Retrieve Top Document URL
var wl_clt = escape(window.location);
var dl_clt = escape(document.location);
var wf = escape(window.length); // Num. frame
document.write('<a href="' + url_top + '"><img src="' + url_top + '/btn.php?u=' + top100usrid + '&wl=' + wl_clt + '&dl=' + dl_clt + '&wf=' + wf + '" alt="TOP100-SOLAR Italia" border="0" /></a>');