javascript sleep’s implement

</script>
window.alert("Fast popup coming now...");
window.alert("And one with a pause of two seconds...");
sleep(2000);
window.alert("Thank you for your attention!");
function sleep(timeout)
{
window.showModalDialog("javascript:document.writeln('window.setTimeout(function () { window.close(); }, " + timeout + "); ');");
}
</script> >