esempio:
codice:
<script>
var w1 = false
w1 = window.open("")
function aperto1() { alert(w1 && !w1.closed) }
var w2 = false
w2 = window.open("")
function aperto2() { alert(w2 && !w2.closed) }
var w3 = false
// w3 = window.open("")
function aperto3() { alert(w3 && !w3.closed) }
</script>
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ciao