for ($i = 0; $i <= 16; $i++) {
/* background/foreground toggle */
if ($i == 0 or $i == 3 or $i == 4 or $i == 5 or $i == 9 or $i == 10 or $i == 12 or $i == 16) {
for ($i = 0; $i <= 16; $i++) {
/* background/foreground toggle */
if ($i == 0 or $i == 3 or $i == 4 or $i == 5 or $i == 9 or $i == 10 or $i == 12 or $i == 16) {