Help with AS 3.0 in CS4 (Links)

Question

I have been building a site, and on the home page I have some images, and text fields that I have converted to buttons. I am trying to link these button to webpages. I use this code:
var getYahoo:URLRequest = new URLRequest("http://www.yahoo.com");
homeibd_btn.addEventListener(MouseEvent.CLICK,goToURL);
function goToURL(event:MouseEvent):void
  var targetURL:URLRequest = new URLRequest("http://www.yahoo.com");
  navigateToURL(getYahoo);
This code works with 1 image. if I change the instance name to another button i get the 1009 error that it cant access a null object. I dont understand what is going on. why does it work with 1 button but not another?

Answer 1

Another possibility is that you used some kind of transition for the object but didn't name it in all of the keyframes.  When you transition an object in a timeline tween and don't name it in the first keyframe, the latter keyframes adopt that lack of a name event though you might assign a name in them.
What you should do is go into your Publish Settings and in the Flash section select the option to Permit Debugging.  This will add a line number following the frame number in the error message.  Once you know which line is causing the problem, try tracing the object that is in that line.  You will most likely find out it is null, and it will be because of one of the reasons I've mentioned (I don't think I forgot any others, but it's possible).