CentOS - Sep 2010 - exclude mirror

how can i exclude certain mirrors from yum in centos 5?

-- 
Among the maxims on Lord Naoshige's wall, there was this one: "Matters
of
great concern should be treated lightly." Master Ittei commented,
"Matters
of small concern should be treated seriously."
(Ghost Dog : The Way of The Samurai)
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>how can i exclude certain mirrors from yum in centos 5? 
http://lmgtfy.com/?q=yum+exclude+mirrors&l=1