Quick ActionScript 3 url question

Hey, I'm currently using the piece of ActionScript below to open a link when pressing a button. The problem is the link is opening in a new tab/window. What do I need to do so flash opens the site in the same window (the flash application will be placed on a website)?

Netherlands.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
function mouseDownHandler(event:MouseEvent):void {
    navigateToURL(new URLRequest("index.php/destinations/netherlands"));
}

Code (markup):

 

This is how it should be:

Netherlands.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
function mouseDownHandler(event:MouseEvent):void {
    navigateToURL(new URLRequest("index.php/destinations/netherlands"), "_self");
}

Code (markup):

See where I added ,"_self"

If that doesn't work how you want it then change self to parent.