My way of doing it. Make two points, one the centre of the circle for within and one x meters away. Create projection objects for both 4326 and your webmap meter projection. If the webmap projection is not 900913, then remember to include the projection definition script. Transform the points to 4326, substract and send that. I dont know st_dwithin (I use the above when a DWITHIN filter on WFS) but also check whether it expects lat/lon or lon/lat order.
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