<!-- Begin
function checkfields(which){

var pass = true;
var msg = "Por favor complete los siguientes campos:\n\n";

if (which.elements[0].value.length < 1)
{
   	pass= false;
		msg += "- Nombre\n";
}

if (which.elements[1].value.length < 1)
{
   	pass= false;
	msg += "- E-mail\n";
}

if (which.elements[4].value.length < 1)
{
   	pass= false;
	msg += "- País\n";
}

if (which.elements[5].value.length < 1)
{
   	pass= false;
	msg += "- Mensaje\n";
}


if (pass == false)
{
	alert (msg);
	return false;
}

}
//  End -->