Dynamicly loading text problem

1

I came across the following lines of code in the tutorials section:

loadText = new loadVars();
    loadText.load("kirupa.txt");
    //creating the loadVarsText function
    loadText.onLoad = function() {
    		scroller.text = this.kirupatext;
    };

 This does NOT work for me..
 I get the following output warning:

Warning Symbol=menuAnim, layer=txtarea, frame=43:Line 1: The identifier ‘loadVars’ will not resolve to built-in object ‘LoadVars’ at runtime.
loadText = new loadVars();

 I use MX 2004 and AS1.
 
 I'd like to use this, but i can't figure out what the problem is...
 
 The complete tut can be viewed here:

dynamic_scroller.htm

Thx in advance