I need help with this script

Can someone help me with this? Nothing works beyond the // *############

<script>
function $_(IDS) { return document.getElementById(IDS); }
function calculate_paid() {
   var amtpaid = document.getElementById("amtpaid");
   var rentdue = document.getElementById("rentdue");
 var prevbal = document.getElementById("prevbal");
var hudpay = document.getElementById("hudpay");
var tentpay = document.getElementById("tentpay");
 var datepaid = document.getElementById("datepaid");
 var late = document.getElementById("late");
 var damage = document.getElementById("damage");
 var courtcost = document.getElementById("courtcost");
 var nsf = document.getElementById("nsf");
var latechg = document.getElementById("latechg");
 var secdep = document.getElementById("secdep");
  var paidsum = document.getElementById("paidsum");
  var dateNow = new Date();
  var dayNow = dateNow.getDate();
  var datePaid = (dateNow.getMonth()+1)+"/"+dateNow.getDate()+"/"+dateNow.getFullYear();
datepaid.value = datePaid;
// ***************************************************************************************
// * if paid later than the 5th of the month, insert an "L" in the late field and add 10 the the rentdue 
// *************************************************************************************** 
              if(dayNow > 5) { late.value = "L"; rentdue = rentdue + 10; }
// ***************************************************************************************
// * add the amtpaid (current) to any previous payments (paidsum)
// *************************************************************************************** 
              paidsum.value = parseInt(paidsum.value) + parseInt(amtpaid.value);
// ***************************************************************************************
// * tentpay = amtpaid - hudpay
// ***************************************************************************************
             tentpay.value = parseInt(tentpay.value) + parseInt(amtpaid.value) - parseInt(hudpay.value);
// ##############################################################
// * totOwed = everything = everything owed
// ***************************************************************************************
          var totOwed = parseInt(rentdue.value) + parseInt(prevbal.value) + 
parseInt(secdep.value) + parseInt(damage.value) + parseInt(latechg.value) + 
parseInt(courtcost.value) + parseInt(nsf.value) - parseInt(hudpay.value);
// ***************************************************************************************
// * stillOwed = what is still owed after the payment(amtpaid)
// ***************************************************************************************
          var stillOwed = totOwed - parseInt(amtpaid.value);
// ***************************************************************************************
// * if an excess has been paid, prevbal will be a minus amt & all previous chgs will be zero
// ***************************************************************************************
       if (amtpaid.value >= totOwed) { prevbal.value = totOwed - amtpaid.value; secdep.value = 0; 
       damage.value = 0; latechg.value = 0; courtcost.value = 0; nsf.value = 0;}
// ***************************************************************************************
// * if money is still owed, pay in order-prevbal,secdep,damage,latechg,courtcost,nsf
// * until payment is exhausted
// ***************************************************************************************
if (stillOwed >= prevbal.value) {stillOwed = stillOwed - prevbal.value; prevbal.value = 0;}
if (stillOwed > 0) {prevbal.value = prevbal.value - stillOwed; stillOwed = 0;}
if (stillOwed >= secdep.value) {stillOwed = stillOwed - secdep.value; secdep.value = 0;}
if (stillOwed > 0) {secdep.value = secdep.value - stillOwed; stillOwed = 0;}
if (stillOwed >= damage.value) {stillOwed = stillOwed - damage.value; damage.value = 0;}
if (stillOwed > 0) {damage.value = damage.value - stillOwed; stillOwed = 0;}
if (stillOwed >= latechg.value) {stillOwed = stillOwed - latechg.value; latechg.value = 0;}
if (stillOwed > 0) {latechg.value = latechg.value - stillOwed; stillOwed = 0;}
if (stillOwed >= courtcost.value) {stillOwed = stillOwed - courtcost.value; courtcost.value = 0;}
if (stillOwed > 0) {courtcost.value = courtcost.value - stillOwed; stillOwed = 0;}
if (stillOwed >= nsf.value) {stillOwed = stillOwed - nsf.value; nsf.value = 0;}
if (stillOwed > 0) {nsf.value = nsf.value - stillOwed; stillOwed = 0;}
}
</script>

Code (markup):

 

What web browser do you use?

if in internet explorer click on the little triangle icon and post the error message.

if Firefox click Tools->error console and post the output

I will examine your code, but the error messages if any would be very helpful.

BTW if your input uses decimals then you should use parseFloat() not parseInt().

 

Thanks for your input. there are no error messages and no decimals. When I enter the amtpaid the datepaid(current date), tentpay, "L"(late) & paidsum are inserted. None of the other fields are inserted. I imagine there are better ways to code this.