Form field validation: All required data lost when clicking browser-back-button!

Hi folks,
I have a big problem using the validation text field components of Spry when the user must click the browser back button (or clicking a history.back()-Link) because he has entered a wrong CAPTCHA-code!
Right now, all the data - only in the required fields - not in the optional fields!!! - is lost and the user has to enter all data once again;-(
Does anybody know why only the data in the required fields is lost? Is there a nice workaround?
I really appreciate a quick answer:-)
Kind regards from cloudy Germany
Thomas

rememberFormInputs('frmlogin', 'input-');
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remove the
// overload alert
function alert(str) {
     var el = document.getElementById('alert');
     if (el) {
          el.value += str+"\r\n";
Its really bad practice to overwrite the alert. and inside the rememberFormInputs remove these lines:
alert('old value remembered: '+old_value);
alert('setCookie: '+name + ' = '+value);
and it should work

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Form field validation: All required data lost when clicking browser-back-button!

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