If I'm understanding you correctly you need zoomToExtent [1], passing in an
OpenLayers.Bounds() object configured with your lon/lat pairs [2], e.g.
map.zoomToExtent(new OpenLayers.Bounds(lattiude1, longitude1,
lattitude2, longitude2));
[1]
http://dev.openlayers.org/releases/OpenLayers-2.9/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.zoomToExtent
[2]
http://dev.openlayers.org/releases/OpenLayers-2.9/doc/apidocs/files/OpenLayers/BaseTypes/Bounds-js.html#OpenLayers.Bounds
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