Oh..
You need to add a instance variable to the "LightObj". Maybe call it "Power"(Type is Number, Default 0).
So on start of the app, Lights is off (I assume off is frame 0 and on is frame 1)
So on mouse click,
check "LightObj" variable "Power" is = 0?
If yes, set "Power" to 1 and Frame to 1 (its on now).
else
If no, set "Power" to 0 and Frame to 0 (its off now).
something like this.