>   google.maps.event.addListener(map, 'idle', function() {
>     number++;

This listener attaches to your original map

>     var map = new
> google.maps.Map(document.getElementById("map_canvas"), myOptions);
>     ctaLayer.setMap(map);

This destroys your original map, and makes a new one (with no
listener)

Why don't you have two KmlLayer objects, one map, and just switch
between them with setMap?

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