This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
There are lots of tools in the modern browsers that can help diagnose these types of problems. In addition to View Source, all modern browsers except Firefox have built-in debuggers. For Firefox, there's the Firebug plugin.