function InizioPagina(pagina,indietro,avanti)
{
  document.write('<table style="width:100%; background-color:yellow">');
  document.write('<tr>');
  document.write('<td style="width:10%">');
  if (indietro.length>0)
    {
      document.write('<a href="'+indietro+'.htm">');
      document.write('<img src="indietro.gif" alt="indietro" width="40" height="40" style="border-style:none" />');
      document.write('</a>');
    }
  document.write('</td><td style="width:80%; text-align:center">');
  document.write('Introduzione a Javascript - '+pagina+' -<br /><small>a cura di <a href="http://www.robertobigoni.it">R. Bigoni</a></small>');
  document.write('</td><td style="width:10%">');
  if (avanti.length>0)
    {
      document.write('<a href="'+avanti+'.htm">');
      document.write('<img src="avanti.gif" alt="avanti" width="40" height="40" style="border-style:none" /></a>');
    }
  document.write('</td></tr></table><hr style="height:3px" />');
}

function FinePagina(indietro,avanti)
{
  document.write('<hr style="height:3px" />');
  document.write('<table style="width:100%; background-color:yellow">');
  document.write('<tr>');
  document.write('<td style="width:10%">');
  if (indietro.length>0)
    {
      document.write('<a href="'+indietro+'.htm">');
      document.write('<img src="indietro.gif" alt="indietro" width="40" height="40" style="border-style:none" /></a>');
    }
  document.write('</td><td style="width:80%; text-align:center">');
  document.write('<img src="../../valid-xhtml10.gif" alt="Valid XHTML 1.0!" height="31" width="88"; border-style:none />');
  document.write('</td><td style="width:10%">');
  if (avanti.length>0)
    {
      document.write('<a href="'+avanti+'.htm">');
      document.write('<img src="avanti.gif" alt="avanti" width="40" height="40" style="border-style:none" /></a>');
    }
  document.write('</td></tr></table><hr style="height:3px" />');
}

function mostraJS(nf)
{
  wnd = window.open("","_blank","toolbar=no, location=no, directories=no, status=no, menubar=yes, scrollbars=yes, resizable=yes, copyhistory=no, width=400, height=400");
  wnd.document.open("text/plain");
  wnd.location = nf;
}