Open Layers

gistfile1.js

    var map = new OpenLayers.Map('map', {
        controls: [
            new OpenLayers.Control.Navigation(),
            //new OpenLayers.Control.PanZoomBar(),
        ],
        numZoomLevels: 10,
		restrictedExtent: new OpenLayers.Bounds(-20037508.34 * 100,-20037508.34,20037508.34  * 100,20037508.34)
    });

	var osm = new OpenLayers.Layer.OSM(
		"OSM"
	);
	map.addLayer(osm);
	
    var styles = new OpenLayers.StyleMap({
        "default": {fillColor: "#B7BB09",pointRadius: 7, fillOpacity: 1, strokeColor: "#B7BB09", strokeWidth: 0 },
        "select": {fillColor: "#B7BB09",pointRadius: 7, fillOpacity: 0.5, strokeColor: "#B7BB09", strokeWidth: 0 }
    });	
	
	markers = new OpenLayers.Layer.Vector("Markers",{
		visibility: true,
        styleMap: styles
	});
	map.addLayer(markers);
	
	function set_marker(longitude, latitude, title) {
		marker = new OpenLayers.Feature.Vector(new OpenLayers.Geometry.Point(longitude, latitude).transform(
			new OpenLayers.Projection("EPSG:4326"),//transform from WGS 1984
			new OpenLayers.Projection("EPSG:900913") // to Spherical Mercator Projection
		),null);
		markers.addFeatures([marker]);
	};
	
	set_marker('13.4023','52.5016', 'Berlin');
	set_marker('0','0', 'Center');	
	
    var hover = new OpenLayers.Control.SelectFeature(markers, {
        hover: true
    });
    map.addControl(hover);
    hover.activate();
	
	// var click = new OpenLayers.Control.SelectFeature(markers, {
	// 	click: true
	// });
	//     map.addControl(click);
	//     click.activate();
	// 
	// markers.events.on({
	// 	featureselected: function(obj) {
	// 		alert("hello");
	// 	}
	// });
	
    map.setCenter(new OpenLayers.LonLat(0, 30).transform(
		new OpenLayers.Projection("EPSG:4326"),//transform from WGS 1984
		new OpenLayers.Projection("EPSG:900913") // to Spherical Mercator Projection
	), 2);