Hey I got the solution. I am using two events to get the bounding box after
every pan/zoom.

map.events.register('zoomend', null, function() {
         test =map.getExtent().transform('EPSG:900913','EPSG:4326'); 
 alert (test);

}); 
         map.events.register("moveend", map, function() {
test=   map.getExtent().transform('EPSG:900913','EPSG:4326'); 
          alert(test);
        });


Thanks
Aditya Kumar



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GIS Developer

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