function Trim(strTesto) {
	while (strTesto.substring(0,1) == ' ') {
		strTesto = strTesto.substring(1, strTesto.length);
	}
	while (strTesto.substring(strTesto.length-1, strTesto.length) == ' ') {
		strTesto = strTesto.substring(0, strTesto.length-1);
	}
	return strTesto;
}
function checkForm() {
	var email_reg_exp = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;
	if (Trim(document.getElementById('nome').value) == "") {
		alert("insert full name");
		document.getElementById('nome').focus();
		return false;
	}
	if (Trim(document.getElementById('paese').value) == "") {
		alert("insert country");
		document.getElementById('paese').focus();
		return false;
	}
	if (Trim(document.getElementById('email').value) == "") {
		alert("insert e-mail adress");
		document.getElementById('email').focus();
		return false;
	}
	if (!email_reg_exp.test(document.getElementById('email').value)) {
		alert("e-mail address is incorrect");
		document.getElementById('email').focus();
		return false;
	}
	if (document.getElementById('tipo').value == "") {
		alert("select the accommodation");
		return false;
	}
	if (Trim(document.getElementById('dataa').value) == "") {
		alert("insert arrival date");
		document.getElementById('dataa').focus();
		return false;
	}
	if (Trim(document.getElementById('datap').value) == "") {
		alert("insert departure date");
		document.getElementById('datap').focus();
		return false;
	}
	if (Trim(document.getElementById('numero_persone').value) == "") {
		alert("insert number of people");
		document.getElementById('numero_persone').focus();
		return false;
	}
}