converts IP address to decimal format

IP2Decimal.js

/* IP2Decimal.js - converts IP address to decimal format
 * @author - Livingston Samuel
 */

var IP2Decimal = function (ip) {
    var ipSyntax = /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/, ipArr, i = 4, decVal = 0;

    if (ipSyntax.test(ip)) {
        ipArr = ip.split(".");

        while (i--) {
            if (ipArr[i] > 255) {
                throw new Error("Invalid IP Address");
            } else {
                decVal += Math.pow(2, (8 * i)) * ipArr[3 - i];
            }
        }

        return decVal;
    } else {
        throw new Error("Invalid IP Address");
    }
};