How to revert file to few revisions back?

Hi!
I have trouble with one thing in svn. I often want to "go back" a few
revisions of particular file. But when I do

rm FILE
svn update -r SomeOldRevison FILE

after making changes to FILE commit fails with something like
svn: Out of date: 'FILE' in transaction 'SomeNewRevision'

I looked through SVN book, read FAQ and history but find no easy
solution. Currently I do :

rm FILE
svn update -r SomeOldRevison FILE
cat FILE > /tmp/FILE
svn update FILE
cat /tmp/FILE > FILE
rm /tmp/FILE

Is there some other, less cumbersome way to do this?

-- 
Witold Rugowski
http://nhw.pl/wp/
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