//Nombres / Nombres, Email, Ciudad, Pais, Tour, Telefono, Fax, Dia, Mes, Ano, Comentarios
function validar(form){

 if(form.Name.value=="")
 {
  alert("Write their Name and Last names");
  return false;
 }

 //E-mail
  if (form.Email.value=="")
  {
  alert(" Write their mail");
  return false;
 }
 
  if (form.Email.value.indexOf("@")==-1)
  {
  alert("Write their mail correctly");
  return false;
 }
 
 if (form.Email.value.indexOf(".")==-1)
  {
  alert("EWrite their mail correctly");
  return false;
 }
 
 //Ciudad
  if(form.Ciudad.value=="")
 {
  alert("Write their City");
  return false;
 }
 
//Pais
 if(form.Pais.value=="0")
 {
  alert("Select their Country");
  return false;
 }

//Tour
 if(form.Tour.value=="0")
 {
  alert("Select a tour");
  return false;
 }
 
//Telefono
if (form.Telefono.value=="")
  {
  alert("Write their phone");
  return false;
 }

if (isNaN(parseInt(form.Telefono.value)))
  {
  alert(" Write their phone correctly");
  return false;	
 }

//Dia
 if(form.Dia.value=="0")
 {
  alert("Select the arrival day");
  return false;
 }
 
 //Mes
 if(form.Mes.value=="0")
 {
  alert("Select the arrival month");
  return false;
 }

//Aņo
 if(form.Ano.value=="0")
 {
  alert("Select the arrival year");
  return false;
 }

//Numero de Personas
if (form.Npersonas.value=="")
  {
  alert("Write the number of people of their group");
  return false;
 }

if (isNaN(parseInt(form.Npersonas.value)))
  {
  alert("Write people's of their group number correctly");
  return false;	
 }
 
Mensaje = "Mr(Mrs.): " + form.Name.value + "\n\n" +
          "Please revise if their entered data are correct:\n" +
          "\nCity: " + form.Ciudad.value +
          "\nCountry Code: " + form.Pais.value+
          "\nTour Code: " + form.Tour.value+
          "\nPhone: " + form.Telefono.value +
          "\nE-mail: " + form.Email.value +
          "\nNumber of people: " + form.Npersonas.value  +
          "\nArrival dates: " + form.Dia.value + " de " + form.Mes.value +  " del " + form.Ano.value + "\n"+
          "\nIf their data are correct it presses to ACCEPT, or to CANCEL to correct.";
          
return confirm(Mensaje);
}