Format Value into Dollar using javascript

Format decimal or int value to dollar format using javascript method.
For example, if used 10000 then using below method it will be replaced with 100,00.

       
<script type="text/javascript">
 function formatDollar(num, obj) {
            num = num.replace(/,/g, '');
            if (isNaN(parseFloat(num)) == false) {
                var p = parseFloat(num).toFixed(2).split(".");
                obj.value = p[0].split("").reverse().reduce(function (acc, num, i, orig) {
                    return num + (i && !(i % 3) ? "," : "") + acc;
                }, "") + "." + p[1];

            }
        }

function ValidateCurrency(evt) {
            evt = (evt) ? evt : window.event;
            var charCode = (evt.which) ? evt.which : evt.keyCode;
            if ((charCode > 47 && charCode < 58) || (charCode == 8 && charCode == 46 && charCode == 16 && charCode == 27 && charCode == 37 && charCode == 39 && charCode == 38 && charCode == 40 && charCode == 36)) {
                return true;
            }
            else {
                return false;
            }
        }
    </script>

How to use:

<asp:TextBox ID="txtEstimatedValue"  onblur="javascript:formatDollar(this.value,this);" onkeyup="javascript:return ValidateCurrency(event)" runat="server" CssClass="textbox" MaxLength="12"></asp:TextBox>