Create GUID using JavaScript

function CreateGUID(){
    var guid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
            var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
            return v.toString(16);
    });
    return guid;
}

//call this to get GUID
CreateGUID();