Identifying images referenced in HTML

[eluser]Myles Wakeham[/eluser]
I'm sure that someone has done this, or knows of a script to do it, but I need something that can read through HTML code, looking for IMG references and identify the full image that is returned (ideally returning an array of all of the unique images referenced in the HTML code). Since I don't really want to re-invent the wheel here, does anyone know of any open source code floating around that does this?

M