> Ground image overlay and markers reload does not work together.

It does work for other people, so it must be something in your
code ...

> I try to build map with ground overlay and load different XML files
> after user press button.
> It does not reload markers instead it loads same or load new set of
> markers.
>
> Try:http://www.youneeditall.com/google-map-api/newmap/

In your readMap() function, these lines are commented out -
    // empty the arrays
    // gmarkers = [];
    // htmls = [];
so every time you read another XML file they just grow longer.

But it still won't work the way you want if you just clear out the
content of gmarkers[] either, that desn't remove anything from the
map.
Write some code that loops through gmarkers[] and does
   map.removeOverlay(gmarkers[i]);
or something like for each existing marker.
Then clear your arrays.

cheers, Ross K

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