how to show a map with openstreetmap code example

Example: show map openstreetmap

<html>
<head>
<title>layer OSM </title>
    
<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
<script type="text/javascript">
	
// Posizione iniziale della mappa
    var lat=44.355;
    var lon=11.71;
    var zoom=13;
		
    function init() {
 
        map = new OpenLayers.Map ("map", {
            controls:[ 
			new OpenLayers.Control.Navigation(),
                       new OpenLayers.Control.PanZoomBar(),
                       new OpenLayers.Control.ScaleLine(),
                       new OpenLayers.Control.Permalink('permalink'),
                       new OpenLayers.Control.MousePosition(),                    
                       new OpenLayers.Control.Attribution()
				      ],
            projection: new OpenLayers.Projection("EPSG:900913"),
            displayProjection: new OpenLayers.Projection("EPSG:4326")
            } );
 
		var mapnik = new OpenLayers.Layer.OSM("OpenStreetMap (Mapnik)");
		
		map.addLayer(mapnik);
 
        var lonLat = new OpenLayers.LonLat( lon ,lat )
          .transform(
            new OpenLayers.Projection("EPSG:4326"), // transform from WGS 1984
            map.getProjectionObject() // to Spherical Mercator Projection
          );
			  
		map.setCenter (lonLat, zoom);
 
 }
 
</script>
</head>
 
<body onload="init();">
 <span style="font-family: Arial; font-weight: bold;">Esempio di mappa OSM</span>
<div style="width:100%; height:95%" id="map"></div>
</body>
 
</html>

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