create a new class named WADAResultsRowLight:
.WADAResultsRowLight {
background-color: #c3c3c3;
}
then change:
$WARRT_AltClass1 = new WA_AltClassIterator(explode("|", "WADAResultsRowDark|"));
to:
$WARRT_AltClass1 = new WA_AltClassIterator(explode("|", "WADAResultsRowDark|WADAResultsRowLight"));