function initNaturfreundehaeuser() {
							var mgr = new MarkerManager(map306004);
					
							dojo.xhrGet({
							url: "/geo/ajax/layeritems/type/naturfreundehaeuser/title/Naturfreundehäuser/lat/" + map306004.getCenter().lat() + "/lng/" + map306004.getCenter().lng() + "/zoom/" + map306004.getZoom() + "/pixel/" + map306004.getSize().width,
							handleAs: "json",
							load: function (data,ioArgs){
								var batch = [];
								for (var i in data["items"]){
									var point = new GPoint(data["items"][i]["lng"], data["items"][i]["lat"]);
									var marker = createMarker(point, data["items"][i]["url"], data["items"][i]["img"], data["items"][i]["login"],"small");
									doItemInfo(marker,data["items"][i]["infos"]);batch.push(marker);
								}
								mgr.addMarkers(batch,0);
								mgr.refresh();
							}
							});
					
							return mgr;
						}var display_naturfreundehaeuser = false;
					  var mgr_naturfreundehaeuser = null;
						function switchNaturfreundehaeuser() {
							var icon = dojo.byId("naturfreundehaeuserIcon");
							var tooltip = dojo.byId("naturfreundehaeuserTooltip");
							if (!display_naturfreundehaeuser) {
								mgr_naturfreundehaeuser = initNaturfreundehaeuser();
								display_naturfreundehaeuser = true;
								dojo.attr(icon,"src","/app/i/layernaturfreundehaeuser_on.gif");
								dojo.attr(tooltip,"innerHTML","Naturfreundehäuser<br />- Aus -");
							} else {
								mgr_naturfreundehaeuser.clearMarkers();
								mgr_naturfreundehaeuser = null;
								display_naturfreundehaeuser = false;
								dojo.attr(icon,"src","/app/i/layernaturfreundehaeuser.gif");
								dojo.attr(tooltip,"innerHTML","Naturfreundehäuser<br />- An -");
							}
						}function doItemInfo(marker,info) {
							GEvent.addListener(marker,"click",function() {
								var html = "<div class='layerInfoWindow'>"
												 + "<h6>" + info["title"] + "</h6>"
												 + "<p>" + info["bs_adr_strasse"] + "<br />"
												 + info["bs_adr_plz"] + " " + info["bs_adr_ort"] + "<br />"
												 + info["bs_adr_land"] + "</p><br />"
												 + "<p>Email: " + info["bs_email"] + "<br />"
												 + "Homepage: " + info["bs_homepage"] + "<br />"
												 + "Fon: " + info["bs_telefon"] + "<br />"
												 + "Fax: " + info["bs_telefax"] + "</p><br />"
												 + "<p>" + info["bs_desc"] + "</p><br />"
												 + "</div>";
								marker.openInfoWindowHtml(html);
								
							});		
						}