function checkFields() {
missinginfo = "";

if (document.form.NAME.value == "") {
missinginfo += "\n     -  Name";
}

if (document.form.SURNAME.value == "") {
missinginfo += "\n     -  Surname";
}

if ((document.form.EMAIL.value == "") || 
(document.form.EMAIL.value.indexOf('@') == -1) || 
(document.form.EMAIL.value.indexOf('.') == -1)) {
missinginfo += "\n     -  Email";
}

if ((document.form.AREA_CODET.value == "")||
(document.form.TEL.value == "")||
(document.form.AREA_CODET.value.length < 3)||
(document.form.TEL.value.length < 7)) {
missinginfo += "\n     -  Tel";
}

if (document.form.NAME1.value == "") {
missinginfo += "\n     -  Passenger Name";
}

if (document.form.SURNAME1.value == "") {
missinginfo += "\n     -  Passenger Surname";
}

if (document.form.BIRTH_YEAR1.value == "") {
missinginfo += "\n     -  Passenger Birthday";
}

if (missinginfo != "") {
missinginfo ="_____________________________\n" +
"You missed following required fields..:\n" +
missinginfo + "\n_____________________________" +
"\nPlease fill in the form correctly and send again!";
alert(missinginfo);
return false;
return true;
}
else return true;
}