Doesn't appear to be one on the site. But for what it's worth, here's a Macworld article by Kyle Wiens describing the process, though (along with links to other ifixit guides for similar models): http://www.macworld.com/article/145116/2009/12/upgradingharddrives.html
The key quote: "The later G5 iMacs and first Intel models are tough: They have nasty retaining clips holding the front bezel in place. Removing the bezel requires a flat pry tool, such as a credit card or ID badge. You also need to completely remove the LCD display and lower EMI shield before you can access the drive. Rating: Difficult"