Either add a class:
echo("<td class=\"headingClass\">".strtoupper($current) . "</td>");
and define the class in the css.
or add an inline style:
echo("<td style=\"color: red;\">".strtoupper($current) . "</td>");
to remove the ALT style, find the tr tag:
<tr class="<?php echo $WARRT_AltClass1->getClass(true); ?>" >
and remove the class:
<tr >