Opening Web page from As3 to replace current iFrame

How Can I open a web page from the As3 so that it replaces current iFrame (and Flash object).

From stackoverflow

• Do you want to open the web page into the iframe or do you want to replace the whole page containing the iframe?

  The former:

  import flash.net.*;    
  navigateToURL( new URLRequest("url-of-the-page-to-be-opened"), "_self" );
  

  The latter:

  import flash.net.*;    
  navigateToURL( new URLRequest("url-of-the-page-to-be-opened"), "_top" );