function checkform ( form )
{
// ** REQUIRED START **
if (form.EMAIL.value == "") {
alert( "Please enter your Email." );
form.EMAIL.focus();
return false ;
}
if (form.FirstName.value == "") {
alert( "Please enter your First Name." );
form.FirstName.focus();
return false ;
}
if (form.SurName.value == "") {
alert( "Please enter your surname." );
form.SurName.focus();
return false ;
}
if (form.MobilePermission.checked && (form.Mobile4.value == "" || form.Mobile2.value == ""  ||form.Mobile3.value == ""  )) {
alert( "Please enter a complete mobile phone number to receive SMS alerts." );
form.Mobile1.focus();
return false ;
}
if (form.MobilePermission.checked && form.Mobile2.value!= "" && form.Mobile3.value!= "" && form.Mobile4.value!= "" && form.MobileNetwork.value == "") {
alert( "Please select your mobile network to receive SMS alerts." );
form.MobileNetwork.focus();
return false ;
}
{ var mobile
mobile =document.getElementById("Mobile1").value + document.getElementById("Mobile2").value + document.getElementById("Mobile3").value + document.getElementById("Mobile4").value; 
document.getElementById("Mobile").value=mobile; 
return true;
} 
// ** REQUIRED END **
return true ;
}