Something

   // support GetFeatureInfo
            map.events.register('click', map, function (e) {
                document.getElementById('nodelist').innerHTML = "Loading... please wait...";
                var url =  map.layers[0].getFullRequestString(
                    {
                        REQUEST: "GetFeatureInfo",
                        EXCEPTIONS: "application/vnd.ogc.se_xml",
                        BBOX: map.getExtent().toBBOX(),
                        X: e.xy.x,
                        Y: e.xy.y,
                        INFO_FORMAT: 'text/html',
                        QUERY_LAYERS: map.layers[0].params.LAYERS,
                        FEATURE_COUNT: 50,
                        WIDTH: map.size.w,
                        HEIGHT: map.size.h
                    },
                    "http://localhost:8080/geoserver/wms"
                );
                OpenLayers.loadURL(url, '', this, setHTML, setHTML);
                OpenLayers.Event.stop(e);
            });
        }
        </script>