Rails - Aug 2008 - Update picture and not show the one in the browser cache?

Hi,

I''m able to upload a pic and updated it later.
My problem now is that after uploading the old picture is shown, it is
taken from the browser cache I guess.

In my app I only cache js and css.

I''ve tried:

expire_page  "/tabs/#{@tab.id}"
redirect_to(@tab)

But it doesn''t go away until I press F5 in the browser. Then the update
picture is shown.

Any hints?
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