Get Mozilla Browser window handle and GTK widget reference

Hi folks

 Is there a way that I could get GTKWidget reference (for all widgets
on mozilla browser) when the browser is invoked on Unix platforms.

 For NS4.x browser which is Motif based, I could Query the window
heirarchy using XLib calls, and compare the window title and get a
window handle for a particualr window.
 Then  using XtWindowToWidget call, I  can convert that window to a
widget reference.
 
 How do I use it?
 Say  I have to click on a menu item.
 I would first find window reference based on  window title, 
 convert to widget and then traverse the widget heirarchy to find menu
item
 ans send in a click event.


 Netscape6/Mozilla browsers however use GTK.
 I could not find an equivalent way to do the same in GTK/GDK.
 Is there an equivalent to XtWindowToWidget in GTK or
 can someone give me some pointers to a solution?

 I'm stuck at this problem  and cannot proceed ahead.
 Would appreciate your help?


- raju