function checkFields() {
missinginfo = "";
if (document.registerForm.userName.value == "") {
missinginfo += "\n     -  First Name";
}
if (document.registerForm.userSurname.value == "") {
missinginfo += "\n     -  Surname";
}
if (document.registerForm.userAge.value == "" && !document.registerForm.userAgecheck.checked) {
missinginfo += "\n     -  Age";
} 
if (document.registerForm.userAddess.value == "" && document.registerForm.userAddess2.value == "" && document.cpiForm.userAddess3.value == "") {
missinginfo += "\n     -  Address";
}
if (document.registerForm.userPostcode.value == "" && !document.registerForm.userPostcode.checked) {
missinginfo += "\n     -  Post Code";
} 
if (document.registerForm.userTel.value == "" && document.registerForm.userMobile.value == "") {
missinginfo += "\n     -  Mobile / Telephone Number";
}
if (document.registerForm.userEmail.value == "") {
missinginfo += "\n     -  Email";
}

if (missinginfo != "") {
missinginfo = "Please complete all the required information:\n" +
missinginfo;
alert(missinginfo);
return false;
}
else 

return true;
}