Major Problems with _self in AS3

Question

Okay, so I'm pretty much a self-taught Flash newb, so please bear with me if this question has an obvious answer.  I've searched different fixes, and none of them have worked.
I am making a simple button in Flash CS4 with AS3.  The button has a hover effect and that's it.  I am wanting the button to link to a different webpage when clicked on in the same window.  I am using this code:
Button.addEventListener(MouseEvent.CLICK, onMouseClick);
function onMouseClick(e:MouseEvent):void
    var request:URLRequest = new URLRequest("http://www.mysite.com);
    navigateToURL(request, "_self");
When I test the movie in Flash, it works fine.  It takes me to the webpage.  However, when embedded online, it does nothing.  I can click on it, and I will remain there on the same page.  Like it's just a pretty image with a hover effect and no link.  I've tested the button in both IE and Firefox, and it does not work in either.
Now here's the funny thing....when I use _blank instead of _self, it works just fine in both Firefox and Explorer.  Any ideas of what I am doing wrong?
Thank you.

Answer 1

why you are adding the event listener to Button it is one of the cless names flash provides.
Make sure
You have the code where you have your button.
you have named your button instance properly.
and you attach your event listener to the instance with the same name.