function isIdCardNo(num) {        var factorArr = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1);        var parityBit = new Array("1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2");        var varArray = new Array();        var intValue;        var lngProduct = 0;        var intCheckDigit;        var intStrLen = num.length;        var idNumber = num;// initialize        if ((intStrLen != 15) && (intStrLen != 18)) {            return false;        }// check and set value        for (i = 0; i < intStrLen; i++) {            varArray[i] = idNumber.charAt(i);            if ((varArray[i] < '0' || varArray[i] > '9') && (i != 17)) {                return false;            } else if (i < 17) {                varArray[i] = varArray[i] * factorArr[i];            }        }        if (intStrLen == 18) {            // check date            var date8 = idNumber.substring(6, 14);            if (isDate8(date8) == false) {                return false;            }            // calculate the sum of the products            for (i = 0; i < 17; i++) {                lngProduct = lngProduct + varArray[i];            }            // calculate the check digit            intCheckDigit = parityBit[lngProduct % 11];            // check last digit            if (varArray[17] != intCheckDigit) {                return false;            }        }        else { // length is 15            // check date            var date6 = idNumber.substring(6, 12);            if (isDate6(date6) == false) {                return false;            }        }        return true;    }