function validarEmail(email) {
	return !(email.indexOf("@") == -1 || email.indexOf(".") == -1 || email == "");
}
function contact(form) {
	var ret = false;
	with (form) {
		if (firstName.value == "First Name") {
		alert('First name is a required field'); 
        }
		else if (lastName.value == "Last Name") {
		alert('Last name is a required field');
		}
		else if (telephone.value == "Telephone") {
		alert('Phone is a required field');
		}
		else if (email.value == "Email") {
		alert('Email is a required field');
		}
		else if (!validarEmail(email.value)) {
		alert("Invalid email!");
		}
		else {
			ret = true;
		}
	}
	return ret;
}