Drop-Down Menus
I'll close this chapter by showing how to build a basic drop-down menu with DHTML. The menu shown in Figure 13-22 has three links: Dogs, Cats, and Birds. Mousing over Cats causes a submenu to drop down with the names of several cat breeds. Clicking one of those links sends the browser to a web page about that kind of cat.
Figure 13-23 shows the code that drives this drop-down menu. I've already covered everything you must know to understand this code, so take a look at it, and see if you can figure out how it works before reading my explanation.
Figure 13-22. A drop-down menu
Figure 13-23. A basic hierarchical menu
Line-by-Line Analysis ...
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