History back in chrome and safari

Hi,
I am developing a GWT application.
Inside my main GWT window I have an iFrame which loads a non gwt url.
The user can click on links inside the iFrame window to navigate to
other pages.
Now I want to provide back/forward functionality to move back and
forward between the pages loaded in the iFrame.
I tried using the standard history.back() technique and it works fine
on FF and IE but not on Chrome and Safari.
Does anyone know I can accomplish that across all browsers?
Many thanks,
Amir

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