http://imanas.shanghai.nyu.edu/~jhr360/week3//javascriptintro/
Getting the buttons to work took a bit of time as I grew more accustomed to using JavaScript, though I eventually got the boogie right button to work. I had trouble with getting the boogie left button to work, though I figured it out eventually.
For my third button, I inserted a photo of Shrek, but when you press the button, a different photo of Shrek replaces the first one.