function validar(form){

 if(form.nombres.value=="")
 {
  alert("Write your Name");
  return false;
 }
  if(form.apellidos.value=="")
 {
  alert("Write your Last Name");
  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.direccion.value=="")
 	{
	alert("Write your Address");
	return false;
}
if(form.pais.value == "----- Choose Country -----")
 {
  alert("Select your Country");
  return false;
 }
 if(form.comentarios.value=="")
 {
  alert("Write your Comments or Questions");
  return false;
 }
 
Mensaje = "" + form.nombres.value + "\n" +
          	"Please verified your send form:\n\n" +
	  		"\Press OK to Send, or CANCEL to Correct ";
          
return confirm(Mensaje);
}