ActionScript 3.0 :: Opening A Link In A New Window?

I'm primarily an HTML/CSS girl.  I'm pretty new to Flash, and until recently have only worked from the timeline without using any action script other than stop(); and simple goto commands like gotoAndPlay(49);
 
This week, I needed a nav button to take the user into the site from the Flash intro; it's live at [URL]
 
Flash CS4, Action Script 3.  Since I don't write Action Script - yet - and needed the link in a hurry, I Googled for the code.  As you can see, it works fine, but the site opens in a new window, and I don't want it to do that, I want it in the same window.
 
The code is as follows:
 
clickToEnter.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler);
function mouseDownHandler(event:MouseEvent):void  {    
navigateToURL(new URLRequest("http://www.deppimpersonator.com/cms"));
}
 
I thought it might be the use of "new" in front of URLRequest, but of course when I took that out the link didn't work at all.
 
Blind experimentation produced two attempts that simply broke the link (don't laugh ):
 
[Code]...
 
What do I need to add (or remove) from this code? And is this the most efficient way to code an internal link?
 
In case this is browser-specific:  I've only tested this in the latest versions of Firefox and Safari for Mac, OS X 10.6.2 (Snowleopard).  It's the same in both browsers.