In your google_javascript/wagmp_map_2.js file find and remove all the code that looks like this:
if('address_0' == 'address_0')
marker_0.openInfoWindowHtml(address_0.infowindowtext);
}
or like this:
GEvent.addListener(marker_0, 'click', function() {
marker_0.openInfoWindowHtml(address_0.infowindowtext);
});