ActionScript 3.0 :: Button Setup - URLRequest Variable Change

I this code a setup a button that calls a url request from another variable and that works fine:
var venue_www:String = "http://www....1";
var venue_url:URLRequest = new URLRequest(venue_www);
function venue_Click(event:MouseEvent):void {
navigateToURL(venue_url);
vInfo.highlight1.alpha = 1;
} vInfo.venue.addEventListener(MouseEvent.CLICK, venue_Click);

But later on I have a function that changes the venue_www variable among other details. But my button won't update with the new url variable. I've actually also already removed the event listener and re-added it through the script, for whatever its worth.
function setInfo1() {// one for each venue
if (currentVenue=="ATL") {
venue_www = "http://www.....2";
}}