changes:

• fixed case bug
• added function stepLabelsBy(n), so that labels are only shown every n^th power of ten; in the example above n is 2
• added function showMinorTicks(arg), where arg is a boolean indicating whether minor tickmarks are shown; in the example above this is set to false
• added an optional width parameter to the bar objects, so each bar's width can be specified individually (otherwise the default bar width is used); in the example above a narrow "empty" bar is used to physically separate the "16+" category from the rest

This example also shows what can be done with a custom bar. Rolling over displays the value associated with that bar. Clicking the value lets you drag it around the screen.