delete temporary html files

[prad]

sometimes i read emails in my browser because they don't show up
properly in gnus (S-K S-H). when i quit the summary, i get a message
asking me if i want to delete tmp html files.

is there a way to set things so tmp html files are deleted
automatically?

i'm also puzzled as to why the question is asked. why would anyone want
to keep tmp html files around when it's 

a) already visible in one's browser
b) you can get it back anytime with S-K S-H

-- 
in friendship,
prad