function login(){
	$("divMessage").style.display = "none";
	$("divLogin").style.display = "block";
}

function register(){
	$("divMessage").style.display = "none";
	$("divRegister").style.display = "block";
}
function no_reg(){
	$("divRegister").style.display = "none";
	$("divMessage").style.display = "block";
}

function send_login(){
	var u = $$("usr");
	var p = $$("psw");
	if(is_empty(u) || is_empty(p)) return false;
	postHttp(js_msg_ex, "login.php", "usr=" + u + "&psw=" + p, false);
}

function js_msg(txt){
	if(txt) alert(txt);
	else window.location = "index.php";
	if($("buttonSubmit")) $("buttonSubmit").disabled = false;
}

function js_msg_ex(txt){
	if(txt == 'ok') window.location = "index.php";
	else alert(txt);
	if($("buttonSubmit")) $("buttonSubmit").disabled = false;
}

function send_reg(){
	var n = encodeURIComponent($$("nome"));
	var e = $$("email");
	var p = $$("_psw");
	var u = $$("_usr");
	var c = $$("citta");
	if(is_empty(n)) {
		alert("scrivere il nome");
		return false;
	}
	if(is_empty(c)) {
		alert("scrivere la location");
		return false;	
	}
	if(is_empty(u)) {
		alert("scrivere l'username");
		return false;
	}
	if(!is_email(e)){
		alert("scrivere l' e-mail");
		return false;	
	}
	var post =  "name=" + n + "&_usr=" + u + "&_psw=" + p + "&email=" + e + "&citta=" + c;
	postHttp(js_msg_ex, "iscrizione.php", post, false);
}