scr

scr = peripheral.wrap("top")
rl = redstone.getInput("left")
rr = redstone.getInput("right")
rf = redstone.getInput("front")

if rl then
  scr.setUrl("google.de")
end

if rr then
  scr.setUrl("youtube.de")
end

if rf then
  scr.setUrl("about:blank")
end