> if (document.getElementById('Legenda') != null)
I don't think you have any <div id='Legenda'> in your webpage.
You do already have a javascript reference to the div as 'legenda',
from when you created it.
> map.controls[google.maps.ControlPosition.TOP_RIGHT].pop(legenda);
That's all about positioning, not destroying or hiding your legend.
Have you considered something a bit simpler, based around just hiding
and showing the div?
legenda.style.visibility="hidden";
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