Problem with opening HTML in frame

Hi,

I made a navigation movie clip with buttons, whom I want to be set in one frame- so the navigation MC will stand still while the contents body will change in another frame.

In AS 2 it’s easy- just add the frame name in the getURL command.
But I couldn’t mange it in AS 3.

This is the code I used on my button:

b1.addEventListener(MouseEvent.CLICK, onMouseClick);

function onMouseClick (e:MouseEvent):void
{
    var request:URLRequest = new URLRequest("http://www.google.com");
    navigateToURL(request,"bottomFrame") 
}

(Google is just an example, and “bottomFrame” is my frame name…)

Thank you very much!
rlbaris