function validar(formulario) {
	
if (formulario.nombre.value=="") {
window.alert("You must write your NAME");
return false;
}

if (formulario.lastname.value=="") {
window.alert("You must write your LAST NAME");
return false;
}

if (formulario.email.value=="") {
window.alert("You must write your E-MAIL");
return false;
}

if (formulario.direccion.value=="") {
window.alert("You must write your ADRESS");
return false;
}


if (formulario.pais.value=="") {
window.alert("You must write your COUNTRY");
return false;
}

adultos=parseInt(formulario.adultos.value);
if (isNaN(adultos) || adultos<0 || adultos>100) {
window.alert("must enter the number of adults (only numbers) ");
return false;
}

nino=parseInt(formulario.nino.value);
if (isNaN(nino) || nino<0 || nino>100) {
window.alert("must enter the number of Children (only numbers) ");
return false;
}

return true;
}