document.write('<center>'); 
document.write('<table border=0 cellspacing=0 cellpadding="0">'); 
document.write('<tr align=center style=font-size:8pt;>'); 
document.write('<td width="110"><a href="#unidades">Unidades</a></td>'); 
document.write('<td width="110"><a href="#constantes">Constantes</a></td>'); 
document.write('<td width="110"><a href="#prefixos">Prefixos</a></td>'); 
document.write('<td width="110"><a href="#alfa">Alfabeto Grego</a></td>'); 
document.write('<td width="110"><a href="#top">Topo</a></td>');
document.write('</tr></table>'); 
document.write('</center>');