My website has been hacked at some point, and around 220 pages have been modified with a long block of advertising links.

It must have been some time ago, since even my "clean" backup copies of the site are infected.

It's been quite a clever little spambot, randomly scambling the order it placed about 150 links on each page to make it harder for bulk deletion. The links are, for some reason, in black font on my black backgrounds, at the very bottom of pages. For example: http://www.chillwater.org.uk/HH/dull%20thud.htm

What I need to do to eliminate it without hand-editing every file is to use Notepad++ or some such program. Specifically, I need a regular expression or macro that works through batch files and finds the text:

[div style="position:absolute;filter:alpha (the square bracket is actually a left arrow)

It then needs to delete that and all text after it in the whole file, replacing it with:

[/div] [/body]

Any ideas?