Dear All,
        I changed the UpdateLayer() function as follows and it works fine now.
        
        function UpdateLayer()
        {
                var p = new OpenLayers.Format.GeoJSON({
                    'internalProjection': new
OpenLayers.Projection("EPSG:900913"),
                    'externalProjection': new
OpenLayers.Projection("EPSG:4326")
                });
                        
                        var url =
"http://localhost/mystuff/s/D2data.json.fixed?sid="+Math.random();
                        OpenLayers.loadURL(url, {}, null, function(r) {
                   
                    var f = p.read(r.responseText);
                        //alert(r.responseText);
                        map.layers[1].destroyFeatures();
                    map.layers[1].addFeatures(f);
                        });
        
        }
 
Thnx for the support 

Regards
Afroz
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