function jumpTo(lon, lat, zoom) {
    var x = Lon2Merc(lon);
    var y = Lat2Merc(lat);
    map.setCenter(new OpenLayers.LonLat(x, y), zoom);
    return false;
}
 
function Lon2Merc(lon) {
    return 20037508.34 * lon / 180;
}
 
function Lat2Merc(lat) {
    var PI = 3.14159265358979323846;
    lat = Math.log(Math.tan( (90 + lat) * PI / 360)) / (PI / 180);
    return 20037508.34 * lat / 180;
}
 
function addMarker(layer, lon, lat, popupContentHTML, showpopup) {
 
    var ll = new OpenLayers.LonLat(Lon2Merc(lon), Lat2Merc(lat));
    var data = {};
        data.icon = new OpenLayers.Icon('/assets/templates/velojournal/imgs/pin_red.png',
                                        new OpenLayers.Size(21, 25), 
                                        new OpenLayers.Pixel(-11, -25));

    var feature = new OpenLayers.Feature(layer, ll, data); 
    feature.closeBox = true;
    //feature.popupClass = OpenLayers.Class(OpenLayers.Popup.Anchored, {Size: new OpenLayers.Size(200, 100) } );
    //feature.popupClass = OpenLayers.Class(OpenLayers.Popup.FramedCloud, {minSize: new OpenLayers.Size(200, 100) } );
	feature.popupClass = OpenLayers.Class(OpenLayers.Popup.FramedCloud, {minSize: new OpenLayers.Size(200, 100) } );
	feature.data.popupContentHTML = popupContentHTML;
    feature.data.overflow = "hidden";
 
    var marker = new OpenLayers.Marker(ll,data.icon);
    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);
    };*/
	   var markerClick = function(evt) {
        var sameMarkerClicked = (this == this.layer.selectedFeature);
        this.layer.selectedFeature = (!sameMarkerClicked) ? this : null;
        for(var i=0; i < this.layer.map.popups.length; i++) {
            this.layer.map.removePopup(this.layer.map.popups[i]);
        }
        if (!sameMarkerClicked) {
            this.layer.map.addPopup(this.createPopup(feature.closeBox)); 
        }
        OpenLayers.Event.stop(evt);
	   };
	marker.events.register("mousedown", feature, markerClick);
 
    layer.addMarker(marker);

    if (showpopup == true) {
        map.addPopup(feature.createPopup(feature.closeBox));
    };


}
 
function getCycleTileURL(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();
   var limit = Math.pow(2, z);
 
   if (y < 0 || y >= limit)
   {
     return null;
   }
   else
   {
     x = ((x % limit) + limit) % limit;
 
     return this.url + z + "/" + x + "/" + y + "." + this.type;
   }
}