Use javascript in the exported html file to edit a variable in the javascript canvas file.

Hi,
 
This is my first post here. I hope someone can help?
 
I am familiar with Javascript and Animate. 
 
I have an animate file that I have exported (it is a canvas) and I would like to write some javascript within the html file that can change something in the javascript file.
 
Specifically:

I want to edit the reference to "l3" below to "l1" or "l2" on the fly from javascript within my html file.

// stage content:
(lib.fileName = function(mode,startPosition,loop) {
this.initialize(mode,startPosition,loop,{});

// timeline functions:
this.frame_30 = function() {
exportRoot.text.line.gotoAndStop(0);
exportRoot.text.textBlueBG.gotoAndStop("l3");
exportRoot.text.textWhiteBG.gotoAndStop("l3");

}

Any tips or refences to documentations would be great.

Thank you.