Redirecting 404 error pages?

["crazy frog crazy frog" <i.m.crazy.frog () gmail com>]

Hi All,

Recently on one of my domain i found some strange php script with
random numeric names like 3578.php etc etc. and there was one
.htaccess file which contained the apache directive to redirect the
404 pages to this script. and then on searching on google i found that
my sites were displaying porn,cracks etc.i think its a automated
bot/worm.
any ideas on this?
i have about it here:-
http://www.secgeeks.com/ever_checked_that_your_apache_404_page_is_displaying_porn_or_cracks.html

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