Автоматично излизане на POPUP прозорче под mozilla

Ето едно:
Код:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
  <script type='text/javascript'>
  function popup(){
  window.open('proba.html', '','width=350, height=300');
  }
  </script>
 </HEAD>

 <BODY onload='popup()'>
 </BODY>
</HTML>
 

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