default
{
    touch_start(integer total_number)
    {
        vector rot = llRot2Euler(llGetLocalRot());

        if (rot.z == 0)
        {
            rot.z = 90 * DEG_TO_RAD;
        }
        else
        {
            rot.z = 0;
        }
        
        llSetLocalRot(llEuler2Rot(rot));
        
     }
}