[R] How to export plot outputs as "gif"

[mrzung]

Hi, I really need to export plot image as "gif".
I know that other image forms are available with functions like png(),
jpeg() etc.
However, 

The reason that I only need the "gif" form is
                     "gimage" function in "gWidgetstcltk" library only works
with "gif" or "pnm".
I want to load some plot images to "gwindow".

Is there a way to solve this problem?

Thanks.

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