Insert commas

function addCommas(nStr)
{
    nStr += '';
    x = nStr.split('.');
    x1 = x[0];
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    return x1 + x2;
}
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[As you type` ~!@#$%^&*()+?]
example IWS-order_productsSub.php
function checkit(id1){
    var key1= window.event.keyCode
    if (key1>57 || key1<48){
        return;
    }
    document.getElementById('li'+id1).checked=true;
    nStr=document.getElementById(id1).value;
    var start1=1000;
    while(start1!=-1){
        start1= nStr.indexOf(",");
        nStr=nStr.replace(",","");
    }
    nStr += '';
    x = nStr.split('.');
    x1 = x[0];
    x2 = x.length > 1 ? '.' + x[1] : '';
    var rgx = /(\d+)(\d{3})/;
    while (rgx.test(x1)) {
        x1 = x1.replace(rgx, '$1' + ',' + '$2');
    }
    document.getElementById(id1).value=x1+x2;
}