function initialize() {
    var myOptions = {
         zoom: 3,
         center: new google.maps.LatLng(20.0, -35),
         mapTypeId: google.maps.MapTypeId.ROADMAP
    }
    var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    var layerOptions = {
        preserveViewport: true
    }
    var layer = new google.maps.KmlLayer('http://konrad-und-elfi.de/files/Weltreise3.kml', layerOptions);
    layer.setMap(map);
}