Dear users,



I would like to start a function if the layer is on/off.

I tried e.g.


if (this.map.events.triggerEvent("changelayer")){
alert ("here we go");
}


and 
            
if (my_layer.display()){

alert ("here we go");
}


...but so far without success.
Can anybody help please?

Thank you very much, Kai
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