An apparatus for an aircraft structure comprising first and second stringers, each having a vertical stringer portion defining a lengthwise gap. More particularly, a transparent conductive thin film comprising indium oxide as the major component and silicon as a dopant, having a substantially amorphous structure, wherein silicon is incorporated at 0. At starting time, the quantity of the auxiliary-steam is reduced at a constant rate, and that of the self-can steam is increased while a feedback control and a feedforward control are being made. If so, a script is injected in the webpage code or otherwise communicated to the requesting web interface, and the script is executed at the client side.