General cleanup.
Factor out the common styles.
Factor out the common checkbox click handling.
Use += to construct the HTML for the infowindow
Inline some event handlers.
Responding to comments.
Merge pull request #4 from stephenfarrar/data-layer-cleanup

General cleanup. Great pull request. Thanks Stephen!
Merge branch 'gh-pages' of https://github.com/sarahmaddox/techcomm-map into jquerify
Construct the infowindow HTML using jQuery, to get HTML escaping and avoid XSS attacks