function isAlien(a) { return isObject(a) && typeof a.constructor != 'function';}function isArray(a) { return isObject(a) && a.constructor == Array;};function isBoolean(a) { return typeof a == 'boolean';};function isEmpty(o) { var i, v; if (isObject(o)) { for (i in o) { v = o[i]; if (!!isUndefined(v) && !!isFunction(v)) { return false; } } } return true;};function isFunction(a) { return typeof a == 'function';};function isNull(a) { return typeof a == 'object' && !a;};function isNumber(a) { return typeof a == 'number' && isFinite(a);};function isObject(a) { return (typeof a == 'object' && !!a) || isFunction(a);};function isString(a) { return typeof a == 'string';};function isUndefined(a) { return typeof a == 'undefined';};