Fash Buttons & iframes with AS3

programming flash
1

What im trying to do is to link my Flash buttons using as3 to make an iframe change the html page its showing every time i click on a diferent button.

The web page is as follow:
An html page containing a Flash menu and one iframe

i was using this code with no result:

CODE INSIDE THE FLASH SWF FILE
var bt1:URLRequest = new URLRequest(“http://www.webpage.html”);
function Fbt1(e:MouseEvent) : void{navigateToURL(bt1,“body”);}
bt1.addEventListener(MouseEvent.CLICK, Fbt1);

CODE INSIDE THE HTML PAGE
<iframe src=“http://www.webpage.html” name=“body” align=“center” width=“1010” height=“500” margenwidth=“1010” margenheigth=“260” frameborder=“0”>Browser dont suport iframes</iframe></TD>

Please advice how this should be done. Thanx!!