ActionScript 3.0 :: Pass Textbox Value As Variable For URL/Filename To NetStream.play(url)

I would like to pass a value from a text box on stage as the URL or filename to the NetStream.play() argument. example:

var url:String = url_text.text;
var conn:NetConnection = new NetConnection();
conn.connect(null);

[Code].....

The point of the matter is that I'm pulling the values from JavaScript/HTML using the ExternalInterface which changes as the user selects next on a HTML page. The page name (URL) is being parsed and passed back as the video filename. I'm using the text boxes currently just to test/view the values being received and sent to JavaScript. The value send and receive fine, I just can not seem to pass the value into the NetStream.play(JavaScriptValue).

function getTextFromJavaScript(str:String):void {
sending_ti.text = str;
var jsArgument:String = sending_ti.text;

[Code].....