Help with linking to a web page within same browser window

I just upgraded my Flash MX to CS5.5 and am completely stumped at what would appear to be the most basic of functions.

I have a small Flash movie that is embedded on a site. At the end of the movie, there is a call to action to click to another page on that site. However, it appears the only action in the Code Snippets panel is for an action that opens a new browser window. I miss the basic actions panel! Am I missing something here? How do I accomplish what I need to? I tried changing the code to "_self" instead of "_blank" but that doesn't work

Here's the code:

button_5.addEventListener(MouseEvent.CLICK,fl_ClickToGoToWebPage_9);

function fl_ClickToGoToWebPage_9(event:MouseEvent):void

{

    navigateToURL(new URLRequest("purchase.html"), "_blank");

}