This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I am not sure how the linked article fits in with your issue. Did you give styleId a try? The Struts html tags have a property named styleId that renders the html id attribute which is what you would need to use with document.getElementById.