var fieldRequired = Array("lastName", "firstName", "email");
var fieldDescription = Array("Last name", "First name", "Email");

function enviar ()
{
	if (formCheck(document.forms['properties'], fieldRequired, fieldDescription))
	{
		if (! isEmail(document.forms['properties'].email.value))
		{
			alert("Email is not valid.");
			return;
		}

		document.forms['properties'].submit();
	}
}