3자리마다 콤마찍기

// 3자리마다 콤마찍기
function fncComma(intNum) {
if(isNaN(intNum) || intNum.length==0) return "";

var sRetVal = "";
var sTmpVal = "";
var sFractionVal = "";

intNum = intNum.toString();
intNum = intNum.replace(/,/g,"");

var lLengh = intNum.search(/\./);

if (lLengh<0) lLengh = intNum.length;
else sFractionVal = intNum.substr(lLengh);

lLengh = lLengh;
var lRemainder = lLengh % 3;

if (lRemainder == 0 && lLengh > 0) lRemainder = 3;
sRetVal = intNum.substr(0,lRemainder);

while(lRemainder < lLengh) {
sTmpVal = sTmpVal + "," + intNum.substr(lRemainder,3);
lRemainder += 3;
}
sRetVal = sRetVal + sTmpVal + sFractionVal;
return sRetVal;
}