This is a fictional function, you can imagine that it might exist to change the message on the browser's status bar. Any JavaScript statement is allowed in an event handler, so we could also execute direct statement rather than call a function. The above example assumes MSIE, since style sheet modifications aren't supported in Netscape. But, hey, it's just an example. Once again, a convenient table will help summarize the common event and their event handler names.
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The above table is a quick reference guide. There are some important caveats to keep in mind. For one, this is not a comprehensive list of all events, although these are by far the most commonly used. Both browser support additional events for detecting keypresses and other mouse actions, while MSIE supports additional events above and beyond Netscape's. Secondly, you must keep in mind that not every event is applicable to every element.