Javascript calculator in form with php loop

[Fraser]

Hi;

Im trying to get a calculator working in a form.

<script type="text/javascript">
function startCalc<? echo $num; ?>(){
  interval = setInterval("calc<? echo $num; ?>()",1);
}
function calc<? echo $num; ?>(){  
for(i = 1; i < <? echo $reged_cars; ?>; i++){
  calc_car<? echo $num; ?>_lic = document.autoSumForm.car<? echo $num; ?>_lic.value;
  document.autoSumForm.car<? echo $num; ?>_lic_quote.value = (calc_car<? echo $num; ?>_lic * 1)
}
 
     car<? echo $num; ?>_lic_total = document.autoSumForm.car<? echo $num; ?>_lic_quote.value;
     document.autoSumForm.lic_quote.value = ((car<? echo $num; ?>_lic_total * 1)).toFixed(2);
 
  adminfee = document.autoSumForm.admin_fee_quoted.value;
  total_car_lic = document.autoSumForm.lic_quote.value;
  document.autoSumForm.quote_total.value = ((total_car_lic * 1) + (adminfee * 1)).toFixed(2);
  }
function stopCalc<? echo $num; ?>(){
  clearInterval(interval);
}
</script>
 

This semi works, it will place the figure from

document.autoSumForm.car<? echo $num; ?>_lic.value;

into

document.autoSumForm.car<? echo $num; ?>_lic_quote.value

and calculate

adminfee = document.autoSumForm.admin_fee_quoted.value;
  total_car_lic = document.autoSumForm.lic_quote.value;
  document.autoSumForm.quote_total.value = ((total_car_lic * 1) + (adminfee * 1)).toFixed(2);

no problem, but it will not add the

document.autoSumForm.car<? echo $num; ?>_lic.value

together at all.

Example here