You need to define a height and width for your GeoExt.MapPanel:

        new GeoExt.MapPanel({
                
                renderTo        : 'gxMap',
                map             : map,
                height          : 560,
                width           : 710,
                title           : 'Afghanistan Elections Data',
                header          : false,
                center          : centrePoint.transform(new 
OpenLayers.Projection("EPSG:4326"),
map.getProjectionObject()),
                zoom            : initZoom
                        
        });

-----
Bryan R. McBride, GISP
http://www.bryanmcbride.com bryanmcbride.com 
http://geoserving.net/ geoserving.net 
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