I really liked the Webmonkey lessons, but that was a very long time ago, and I have no idea if the lessons they had are at all useful these days.
I've heard the Head First books are good for people who are pretty new to web development, but I have to say that their iPhone development book didn't work for me at all.
Ultimately, the best thing is to save a webpage that someone else made, and to then start tweaking it, and to compare the differences between the old and new versions (use multiple tabs). Then, begin to plan what changes you'd like to see, and see if you can change the page appropriately.
In Chrome or Firefox, the "inspect element" tool is really really useful.
Good luck to your colleague.