Using Javascript to store Data

I've seen posts on how to add Javascript dynamically, and posts on ways to store data with Javascript, and I thought of a way to store data.

I'm trying to add a Javascript file (which contains variables/data) dynamically to a page to get Level data?

EDIT: I've done more testing, I now have an onload check, but the try{ initializeLevel } is still returning an error:

ReferenceError {stack: (...), message: "initializeLevel is not defined"}
message: "initializeLevel is not defined"
stack: (...)
get stack: function () { [native code] }
set stack: function () { [native code] }
__proto__: Error

New Level.js

Level_State = new Object();
Level_State.LOADED = 1921;
Level_State.UNLOADED = 183;
Level_State.CURRENT = '';
function openLevel(src){
    var element = document.getElementById('levelDat');
    try{src.toString();}catch(e){}
    src = 'Level/'+src+'.js';
    element.src = src;
    element.onload = parseLevel();
}
function parseLevel(){
    alert('Parsing JS');
    try{
        initializeLevel();
        generateLevel();
    }catch(e){
        closeLevel();
    }
}
function closeLevel(){
    alert('Error Loading JS FILE');
    var element = document.getElementById('levelDat');
    element.src = '';
}
function generateLevel(){
    alert('Generating JS');
}

and Test.js contains

function initializeLevel(){
    testMap = new MapDat('testMapTheSecond');
    LevelData = new LevelDat('testLevel#2',testMap);
}