Detecting Browser Close - Event Undefined

Mar 29, 2011

function doUnload()
{
if (window.event.clientX < 0 && window.event.clientY < 0)
{
alert("Window is closing...");
} }

I get window.event undefined by using
var evt =window.event? event : e I get e undefined
var evt =window.event? event : e
if (evt.clientX < 0 && evt.clientY < 0){
alert(evt.clientX +"Window is closing...");
}

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