Your full header include would end up looking something like this:

Code
<?php
$tbopen = $wrappers[$wrapper_id]['open'];
$tbclose = $wrappers[$wrapper_id]['close'];

echo <<<HTML_BLOCK
$tbopen
<tr>
<td class="tdheader">
Header class
</td>
</tr>
<tr>
<td class="alt-1">
Alt-1 class
</td>
</tr>
$tbclose
HTML_BLOCK;

?>