integer poweron = 0;

power_on() {
    llSetTexture("wallpaper", ALL_SIDES);
    poweron = 1;
}

power_off() {
    llSetTexture(TEXTURE_TRANSPARENT, ALL_SIDES);
    poweron = 0;
}

default
{
    touch_start(integer total_number)
    {

        // nothing

    }

    link_message(integer sender_num, integer num, string str, key id)
    {

        if(str == "power") {

            if(num == 0)
                power_off();
            else
                power_on();

        } else {
            llOwnerSay("unknown message type: " + str);
        }

    }
}