onStop Event Handler
var counter = 0
var timerID
function startCounter() {
document.forms[0].display.value = ++counter
timerID = setTimeout("startCounter()", 10)
}
function haltCounter() {
clearTimeout(timerID)
counter = 0
}
document.onstop = haltCounter
onStop Event Handler
Click the browser's Stop button (in IE) to stop the script counter.