function validar(form){

if(form.Nombre.value=="")
 {
	 alert("Write your Name");
	 return false;
 }
 
if(form.Apellidos.value=="")
 {
	 alert("Write your Last Name");
	 return false;
 }

if(form.Dia_Nacimiento.value == "Day")
 {
	 alert("Birth date Incorrect");
	 return false;
 }

if(form.Mes_Nacimiento.value == "Month")
 {
	 alert("Birth date Incorrect");
	 return false;
 }
 
if(form.Ano_Nacimiento.value == "Years")
 {
	 alert("Birth date Incorrect");
	 return false;
 }

if (form.Nacionalidad.value=="")
 {
	 alert("Write your Nationality");
	 return false;
 }

if (form.Direccion.value=="")
 {
	 alert("Write your Address");
	 return false;
 }
 
if (form.Telefono.value=="")
 {
	 alert("Write your number Phone");
	 return false;
 }
 
if (form.Mail.value=="")
  {
  alert("Write your E-mail");
  return false;
 }
 
 if (form.Mail.value.indexOf("@")==-1)
  {
  alert("Write your Correct E-mail");
  return false;
 }
 
if (form.Mail.value.indexOf(".")==-1)
  {
  alert("Write your Correct E-mail");
  return false;
 }

if(form.Dia_llegada.value == "Day")
 {
	 alert("Arrival date Incorrect");
	 return false;
 }

if(form.Mes_llegada.value == "Month")
 {
	 alert("Arrival date Incorrect");
	 return false;
 }
 
if(form.Ano_llegada.value == "Years")
 {
	 alert("Arrival date Incorrect");
	 return false;
 }
 
if(form.Clases_Privadas.value =="Selected")
{
	alert("Select Private Lessons Options");
	return false;
}

if(form.Clases_Grupales.value =="Selected")
{
	alert("Select Inmersion Lessons Options");
	return false;
}

if(form.Tandem.value =="Selected")
{
	alert("Select Tandem Lessons Options");
	return false;
}

if(form.Dia_Comienzo_Clases.value == "Day")
 {
	 alert("Select Check in Lessons");
	 return false;
 }

if(form.Mes_Comienzo_Clases.value == "Month")
 {
	 alert("Select Check in Lessons");
	 return false;
 }
 
if(form.Ano_Comienzo_Clases.value == "Years")
 {
	 alert("Select Check in Lessons");
	 return false;
 }
 
 if(form.Dia_Salida_Clases.value == "Day")
 {
	 alert("Select Check out Lessons");
	 return false;
 }

if(form.Mes_Salida_Clases.value == "Month")
 {
	 alert("Select Check out Lessons");
	 return false;
 }
 
if(form.Ano_Salida_Clases.value == "Years")
 {
	 alert("Select Check out Lessons");
	 return false;
 }

if(form.Accommodation_Comida.value == "Selected")
{
	alert("Select Food Options");
	return false;
}

if(form.Volunteer.value == "Selected")
{
	alert("Select Volunteer Options");
	return false;
}
 
 if(form.Observaciones.value=="")
 {
  alert("Write your Comments or Questions");
  return false;
 }
 
Mensaje = "" + form.Nombre.value + "\n" +
          	"Please verified your send form:\n\n" +
	  		"\Press OK to Send, or CANCEL to Correct ";
          
return confirm(Mensaje);
}