single macro which acts as toggle?

[Chris Nestrud]

Hello all. I'm trying to make a macro which will toggle between two sets
of options. I'd either like it to ignore all headers, resulting in none
being displayed when I view a message, or unignore the ones I'm
interested in. I can't find anything like a variable that I can set so
the macro will know what its state is. It's apparently possible to get
the values of variables, but no "if" constructs or anything.

\any ideas?

Chris