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.
James, Parameters and attributes are different. Parameters are passed from the previous page (like when a user submits a form.) Attributes can be set at any time and are distinguished by the get/setAttribute() call.