The is a example how to load a kml file of Google Earth in your article.

{mosmap kml='http://tech.reumer.net/images/florida.kml'|overview='1'}

You can set the center of the map closer to your kml-file center instead of using the world map first. use the parameters centerlat, centerlon and zoom. There will be no extra marker on the map.

{mosmap centerlon='-81.227834'|centerlat='27.107983'|zoom='7'| kml='http://tech.reumer.net/images/florida.kml'}

If you place a link inside the infowindow then it will always open in a new window or tab!
You can use a kml-file and GeoXML to open a link in the same window (see kml sidebar).