ActionScript 2.0 :: Send A Username/password While Connecting To FCS?

I'm making a simple login application. I want to send a username/password while connecting to FCS, and have the SSAS of main.asc connect to a PHP document that will lookup the username/pass and make the necessary checks for the information in a mySQL database.

I'm trying to use the LoadVars() object, maybe you can't do this with SSAS? Or maybe i need to include some other actionscript file (I know when you use components you have to specify load("components.asc"); at the top of the main.asc file --- i'm hoping it's something that easy )

This is my first FCS app, I've done a lot of research but this one's sort of stumping me. I keep getting an error that looks like this:

/opt/macromedia/fcs/applications/my_app/main.asc: line 9: ReferenceError: LoadVars is not defined

Here is my code for main.asc:

Code:
application.onAppStart = function(){
this.userCount = 0;
this.users = [];

[Code]......