echo CONSTANTS

[nikko50]

How do I echo a constant when it is contain in a echo statement such as below...MAINBILLING being the constant??

print "<tr>
<td width='50%'><font size='4'><b>MAINBILLING</td>
<td width='50%'><font size='4'><b>Location: </b></font> $getcssline[id4] </td>
</tr></table>";

[sidney]

like below

 echo"<td width='50%'><font size='4'><b>".MAINBILLING."</td>";