search and replace

I have a database with text in it (articles) and in the article I have <img>
tags for pictures in HTML. I want to go through the DB and replace the urls
of the images. How would I go about doing that? I want to grab all the text
from the articles table and replace the string "http://dopey.lulupress.com"
with "http://faramir/".
Any hints?
-William

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