+var map;
+var markers;
+var popup;
+
+function createMap(divName, centre, zoom) {
+ OpenLayers.Util.onImageLoadError = function() {
+ this.src = OpenLayers.Util.getImagesLocation() + "404.png";
+ }
+
+ map = new OpenLayers.Map(divName,
+ { maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
+ numZoomLevels: 19,
+ maxResolution: 156543,
+ units: 'm',
+ projection: "EPSG:41001" });
+
+ var mapnik = new OpenLayers.Layer.TMS("Mapnik",
+ "http://tile.openstreetmap.org/",
+ { type: 'png', getURL: getTileURL });
+ map.addLayer(mapnik);
+
+ var osmarender = new OpenLayers.Layer.TMS("Osmarender",
+ "http://dev.openstreetmap.org/~ojw/Tiles/tile.php/",
+ { type: 'png', getURL: getTileURL });
+ map.addLayer(osmarender);
+
+ map.addControl(new OpenLayers.Control.LayerSwitcher());
+ map.setCenter(centre, zoom);
+
+ return map;
+}
+
+function getTileURL(bounds) {
+ var res = this.map.getResolution();
+ var x = Math.round((bounds.left - this.maxExtent.left) / (res * this.tileSize.w));
+ var y = Math.round((this.maxExtent.top - bounds.top) / (res * this.tileSize.h));
+ var z = this.map.getZoom();
+
+ return this.url + z + "/" + x + "/" + y + "." + this.type;
+}
+
+function addMarkerToMap(position, icon, description) {
+ if (markers == null) {
+ markers = new OpenLayers.Layer.Markers("markers");
+ map.addLayer(markers);
+ }
+
+ var marker = new OpenLayers.Marker(position, icon);
+
+ markers.addMarker(marker);
+
+ if (description) {
+ marker.events.register("click", marker, function() { openMapPopup(marker, description) });
+ }
+
+ return marker;
+}
+
+function openMapPopup(marker, description) {
+// var box = document.createElement("div");
+// box.innerHTML = description;
+// box.style.display = 'none';
+// box.style.width = "200px";
+// document.body.appendChild(box);
+
+ closeMapPopup();
+
+ popup = new OpenLayers.Popup.AnchoredBubble("popup", marker.lonlat,
+ new OpenLayers.Size(200, 50),
+ "<p>" + description + "</p>",
+ marker.icon, true);
+ popup.setBackgroundColor("#E3FFC5");
+ map.addPopup(popup);
+
+ return popup;
+}
+
+function closeMapPopup() {
+ if (popup) {
+ map.removePopup(popup);
+ delete popup;
+ }
+}
+
+function removeMarkerFromMap(marker){
+ markers.removeMarker(marker);
+}
+
+function mercatorToLonLat(merc) {
+ var lon = (merc.lon / 20037508.34) * 180;
+ var lat = (merc.lat / 20037508.34) * 180;
+ var PI = 3.14159265358979323846;
+
+ lat = 180/PI * (2 * Math.atan(Math.exp(lat * PI / 180)) - PI / 2);
+
+ return new OpenLayers.LonLat(lon, lat);
+}
+
+function lonLatToMercator(ll) {
+ var lon = ll.lon * 20037508.34 / 180;
+ var lat = Math.log(Math.tan((90 + ll.lat) * PI / 360)) / (PI / 180);
+
+ lat = lat * 20037508.34 / 180;
+
+ return new OpenLayers.LonLat(lon, lat);
+}
+
+function scaleToZoom(scale) {
+ return Math.log(360.0/(scale * 512.0)) / Math.log(2.0);
+}