function generateUUID(){

    var d = new Date().getTime();

    var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {

        var r = (d + Math.random()*16)%16 | 0;

        d = Math.floor(d/16);

        return (c=='x' ? r : (r&0x7|0x8)).toString(16);

    });

    return uuid;

};