function change_pag() {
pag1 = document.getElementById("pag_1");
pag2 = document.getElementById("pag_2");
if( pag1.className == "bshow" ) {
pag1.className = "bhide";
pag2.className = "bshow";
}
else {
pag1.className = "bshow";
pag2.className = "bhide";
}
window.scrollTo(0,0);
}

function show_div() {
hid = document.getElementById("hidden");
if( hid.className == "bhide" ) {
hid.className = "bshow";
}
else {
hid.className = "bhide";
}
}

function clock() {
var orologio = new Date();
var HH = orologio.getHours();
var MM = orologio.getMinutes();
var SS = orologio.getSeconds();
parseInt(MM) < 10 ? MM = "0" + MM : null;
parseInt(SS) < 10 ? SS = "0" + SS : null;
document.getElementById('formClock').textClock.value = HH + ":" + MM + ":" + SS;
window.setTimeout("clock()", 1000);
}