Need *fast* help with simple Google Analytics code

I have a coded HTML webpage that contains a button, and when you click on the button, a lightbox popup appears. I would like to add some Google Analytics code on the page, so that each click of the button that triggers the lightbox counts as 1 pageview of /lightbox (a fake page name that I just invented). I believe this can be accomplished by using a bit of "onclick" code, but I'm not sure. Anyway, that's it. 1 page. 1 click I'd like tracked. I need this done quickly. I'm looking to select someone within the next couple of hours, and then need the job turned around within a few hours. Please only bid if you're available to work right now. Thanks!