open cp_vars_style.pl template
change
&ColorRow("Table Border Color", "For invisible borders, set this color the same as your page background color.", "TableBorderColor", "#FFFFFF", "yes");
for
&ColorRow("Table Border Color", "For invisible borders, set this color the same as your page background color.", "TableBorderColor", "#FFFFFF", "no");
open cp_styles.cgi cgi-bin
remove all
"TableBorderColor",
from "#validate"s and upload.