Event handler for Window
The onUnload event handler is used to run a function or JavaScript
code whenever the user exits a document. The onUnload event handler
is used within either the <BODY> or the <FRAMESET> tag,
and uses the following properties of the Event
object:
type - indicates the type of event
target - indicates the target object to which the event was sent.
Compare to the onload event handler.
<BODY onUnload="finishOff()">
This example shows the onUnload event handler being used to execute the 'finishOff' function: