devi usare gli eventi onLoad ed onunload
codice:
<head>
<title>Prova</title>
<SCRIPT LANGUAGE="JavaScript">
function entrata(){
windowLeaving=window.open("popup.html",'Ciao','toolbar=no,location=no,directories=no,menubar=no,scrollbars=no,resizable=1,width=420,height=250');
}
function uscita(){
windowLeaving=window.open("popup.html",'Ciao','toolbar=no,location=no,directories=no,menubar=no,scrollbars=no,resizable=1,width=420,height=250');
}
</SCRIPT>
</head>
nel body poi:
codice:
<BODY onunload="uscita()" onload="entrata()">