I have some Javascript code in an external file, and It's going to be for people to use on their own sites... so I want some way for them to be able to pass in multiple options... how would I do this?

Sorry, more information: 

I would give them html + script + css to load: 

```
    <div class="mywidget"></div>
    <script src="app.js"></script>
    <link rel="stylesheet" type="text/css" href="style.css" />

```

And in the script (some of the code):

```
            var App = {

            init: function(){

                /* ----------------------------
                    On initialization....
                ---------------------------- */

                    App.doStuff(), App.doMoreStuff();

                },
                doStuff: function(){
                  alert('hi');
                }
            }

```

So I basically want them to be able to customize how my app works... so let's say I want them to customize the alert, or any other amount of things.