UUID in JS

uuid.js

var svc = {
    new: function() {
        function _p8(s) {
            var p = (Math.random().toString(16)+"000000000").substr(2,8);
            return s ? "-" + p.substr(0,4) + "-" + p.substr(4,4) : p ;
        }
        return _p8() + _p8(true) + _p8(true) + _p8();
    },
     
    empty: function() {
      return '00000000-0000-0000-0000-000000000000';
    }
};