How do i open in _self?

Got a site and my opening page is made with Flash for the menu, each subsection when clicked is a link to another “.html” Now, when i click the links it opens a new page of the “.html” clicked, but I need it to open in the same window if i cant in the same frame. Cuz it keeps opening new windows…im assuming the fix is with something like “_self”, but in my CS4 under properties of each button under Link I have the URL and selected “_self”. I even put in a new layer called action and used the code below. But when I tried putting ,"_self" after the url in the code i got an error in flash…help

probg.addEventListener(MouseEvent.MOUSE_DOWN, probgHandler);
function probgHandler(event:MouseEvent):void {
navigateToURL(new URLRequest(“probg.html”));
}
proact.addEventListener(MouseEvent.MOUSE_DOWN, proactHandler);
function proactHandler(event:MouseEvent):void {
navigateToURL(new URLRequest(“proact.html”));
}