Index pages modified, iframes linking to b00gle.com inserted

I've been having some security problems, obviously, somehow all index files have been altered by a script, an iframe linking to b00gle.com (a certain page on that site, containing a lot of javascripts, worms, ie exploits, ...) has been inserted so that all visitors viewing the altered files get pop-ups and scripts thrown at them.

Does anyone have experience dealing with these things? Can anyone shed a light on how those things are done, and how to prevent them?

If there is a script to automatically remove a certain text (the inserted iframe for example) from all index-files, that would also be appreciated a lot.

Thanks in advance

 

 

 

 

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