function initMedien() {
							var mgr = new MarkerManager(map2080);
					
							dojo.xhrGet({
							url: "/geo/ajax/layeritems/type/medien/title/Medien/lat/" + map2080.getCenter().lat() + "/lng/" + map2080.getCenter().lng() + "/zoom/" + map2080.getZoom() + "/pixel/" + map2080.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"],"large");
									batch.push(marker);
								}
								mgr.addMarkers(batch,0);
								mgr.refresh();
							}
							});
					
							return mgr;
						}var display_medien = false;
					  var mgr_medien = null;
						function switchMedien() {
							var icon = dojo.byId("medienIcon");
							var tooltip = dojo.byId("medienTooltip");
							if (!display_medien) {
								mgr_medien = initMedien();
								display_medien = true;
								dojo.attr(icon,"src","/app/i/layermedien_on.gif");
								dojo.attr(tooltip,"innerHTML","Medien<br />- Aus -");
							} else {
								mgr_medien.clearMarkers();
								mgr_medien = null;
								display_medien = false;
								dojo.attr(icon,"src","/app/i/layermedien.gif");
								dojo.attr(tooltip,"innerHTML","Medien<br />- An -");
							}
						}