Beginner!!!! Need Help!!! :confused:

validate check for social insurance number.

social insurance number: only 9 digits (1-9), only number, should be input in three boxes, 3 digit in each boxes( if possible use auto tab)

add the odd digits : means 1th,3dr,5th,7th, 9th digits together = odd digits sum value

Extract the even digits: mean 2nd, 4th, 6th, 8th digits-- and multiply by *2, add all the even digits together only if it is less than 10

if the 2nd, 4th, 6th, 8th digits is greater than 10 then , add like this ( for eg the 4th digit is 18 then add= 1+8)

Then,

odd digits sum value + the even digit sum value = multiple of ten (%10)

<!DOCTYPE >

<html>

<head>

<title></title>

</head>

<body>

<script type="text/javascript">

function Validation(sin)

{

var num = sin.match(/^(\d{3})-?\d{3}-?\d{3}$/);

var numDashes = sin.split('-').length - 1;

if (num == null || numDashes == 1) {

alert('Invalid S.I.N. Must be 9 digits or in the form NNN-NNN-NNN.');

msg = "does not appear to be valid";

}

else

if (parseInt(num[1], 10) == 0) {

alert("Invalid SIN: SIN's can't start with 000.");

msg = "does not appear to be valid";

}

else {

msg = "appears to be valid";

alert(sin + "\r\n\r\n" + msg + " Social Insurance Number.");

}

if (!num.test(sin)) return false;

sin = sin.split("-").join("");

var checksum=0;

for (var n = (2 - (sin.length % 2)); n <= sin.length; n += 2) {

checksum += parseInt(sin.chartAt(n - 1));

for (var n = (sin.length % 2) + 1; n < sin.length; n += 2)

var digit = parseInt(sin.charAt(n - 1)) * 2

if (digit < 10) {

checksum += digit;

}

else {

checksum += (digit - 9);

}

}

if ((checksum % 10) == 0) return true; else return false;

}

</script>

<form>

<tt>

SIN #: <input type="text" name="sin" size="11" maxlength="11"/> (use dashes!)

</tt>

<br/><br/>

<input type="button" value="Validate Number" onclick="Validation(this.form.sin.value)"/>

</form>

</body>

</html>

Code is Not Working!!!!

Can u Sent me a Solution for this!!!!!!!