var map, layer_markers; 

function addMarker(layer, ll, popupContentHTML) 
{
	layer.clearMarkers(); // wir wollen nur einen marker zur zeit
	
	var feature = new OpenLayers.Feature(layer, ll);
	feature.closeBox = true;
	feature.popupClass = OpenLayers.Class(OpenLayers.Popup.FramedCloud, {minSize: new OpenLayers.Size(200, 120) } );
	feature.data.popupContentHTML = popupContentHTML;
	feature.data.overflow = "hidden";

	var marker = new OpenLayers.Marker(ll);
	marker.feature = feature;

	var markerClick = function(evt) 
	{
		if (this.popup == null) 
		{
			this.popup = this.createPopup(this.closeBox);
			map.addPopup(this.popup);
			this.popup.show();
		} else 
		{
			this.popup.toggle();
		}
		OpenLayers.Event.stop(evt);
	};
	marker.events.register("mousedown", feature, markerClick);

	layer.addMarker(marker);
}
		
document.observe("dom:loaded", function() 
{
	if(immosm === undefined || immosm.lat == 0.0) {
		return;
	}
	map = new OpenLayers.Map('osmmap',
			{ maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
			  numZoomLevels: 19,
			  maxResolution: 156543.0399,
			  units: 'm',
			  projection: new OpenLayers.Projection("EPSG:900913"),
			  displayProjection: new OpenLayers.Projection("EPSG:4326")
			});

	// Mapnik-Layer
	var layerMapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik");

	// Tiles@Home-Layer
	var layerTah = new OpenLayers.Layer.OSM.Osmarender("Tiles@Home");

	// Layer fuer Marker
	layer_markers = new OpenLayers.Layer.Markers("Address", { 
		projection: new OpenLayers.Projection("EPSG:4326"),
		visibility: true, displayInLayerSwitcher: false });
	layer_markers.setVisibility(true);

	map.addLayers([layerMapnik,layerTah,layer_markers]);
	map.addControl(new OpenLayers.Control.LayerSwitcher());

	var lonLat = new OpenLayers.LonLat(immosm.lon, immosm.lat).transform(map.displayProjection,  map.projection);
	map.setCenter (lonLat, 16);

	addMarker(layer_markers, lonLat, immosm.addr);
});