Try the attached mode, `visible-whitespace-mode'. It is intended for the latest CVS Emacs, but may work ok for Emacs 21.
It's somewhat different from typical "highlight whitespace" packages in that each whitespace character is indicated individually, even when they're adjacent to each other, which makes it easy to see otherwise hard to find whitespace problems. -Miles
visws.el
Description: Emacs mode to indicate individual whitespace characters
-- A zen-buddhist walked into a pizza shop and said, "Make me one with everything."
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