I think this works in Moodle - solved by someone else a couple of weeks ago.
---------------------------
var player = GetPlayer();
function findLMSAPI(win) {
// look in this window
if (win.hasOwnProperty("GetStudentID")) return win;
// all done if no parent
else if (win.parent == win) return null;
// climb up to parent window & look there
else return findLMSAPI(win.parent);
}
var lmsAPI = findLMSAPI(this);
var myName = lmsAPI.GetStudentName();
var array = myName.split(',');
var newName = array[1] + ' ' + array[0];
player.SetVar("newName", newName);
-------------------------------------------