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window.onbeforeunload = function (evt) {
var message = 'Are you sure you want to leave?';
if (typeof evt == 'undefined') {
evt = window.event;
}
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evt.returnValue = message;
}
return message;

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2. javascript:void expression
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<html>
<head>
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function changetext()
{
var x = document.getElementById("list");
for (var i = 0;i < x.length;i++ )
{
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{
    if(obj<24)
        document.cookie = "tdid="+obj;
    if(document.getElementById(e)==null)
    {
        return ;
    }
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    IE   event.keyCode
keycode    8 = BackSpace BackSpace
keycode    9 = Tab Tab
keycode   12 = Clear
keycode   13 = Enter
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