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<SCRIPT LANGUAGE="JavaScript">
function confirmAction()
{
  action = confirm('Ok per continuare, Cancel per uscire')
  if (action==true)
    parent.self.location.href = 'a_page.htm';
  if (action==false)
    alert('Alla prossima');
}
</SCRIPT>
<FORM>
<INPUT TYPE="button" NAME="link" VALUE="Click Here" onclick="confirmAction()">
</FORM>