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.
BTW While not included in the example, the 'left-marker-2.png' image is a left facing triangle, with a little more white to the base to avoid seeing the border of the info box. The point is shown over the element.
Edit: img attributes were stripped by posting!? Now fixed.