Código PHP:
if($n == 1)
echo "<td bgcolor='#0033FF'><font size='2' face='Verdana, Arial, Helvetica, sans-serif'><div align='center'><strong> </strong></div></font></td>";
elseif($n == 2)
echo "<td td bgcolor='#FFFF00'><font color='#FFFF00' size='2' face='Verdana, Arial, Helvetica, sans-serif'><div align='center'><strong>E</strong></div></font></td>";
elseif($n == 3)
echo "<td td bgcolor='#CC9933'><font size='2' face='Verdana, Arial, Helvetica, sans-serif'><div align='center'><strong></strong></div></font></td>";
Saludos!