Javascript Random Number Generator Function

_Random.js

/*
Attaching the time stamp so that based on the returned value , we can find out when it is generated
*/
function _Random(){
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx-te'.replace(/[xye]/g, function (c) {
        var r = Math.random() * 16 | 0;
        if(c == 'e'){ var t = (new Date).getTime(); v = t}
        else{var v = c == 'x' ? r : (r & 3 | 8);}
        return v.toString(16);
    });
}