Manipulating the DOM

Hokey dokey. Got some exercises here to teach folks how to play with elements in the DOM beyond just selection.

@zspencer, your input would be much appreciated; @jfarmer if there is anything else you'd want added to this exercise list, let me know.
Only reason I used this here is to give a more visceral feel to the act of something being clicked with JS. w/o a delay, there is no sense of transition in the state, and the result could be confusing.