I have the script below and am trying to figure out how to add a comma value for the 'thousand' place after the total has been calculated. Anyone know how I can accomplish this?

Code:
<script type="text/JavaScript">
function calculateCheck()
{
var op1=document.getElementsByName('form[swimclubmem1][]');
var op2=document.getElementsByName('form[swimclubmem2][]');
var result=document.getElementById('Total');

result.value=0;

result.value=parseInt(result.value);

for(i=0;i<op1.length;i++)
if(op1[i].checked) result.value=parseInt(result.value)+parseInt(op1[i].value);

for(i=0;i<op2.length;i++)
if(op2[i].checked) result.value=parseInt(result.value)+parseInt(op2[i].value);
}

</script>
Thank you.