your visa (and passport too, incidentally if it applies to you) should be valid six months into the future to get re-entry without any problem. You should be fine so long as you re-enter the US before the end of Jan., 2008 (if your visa expires in July of that year--08). Or think this way, if your visa expires on July 10, 2008 you should be re-entering the US before or by Jan 9, 2008. Does that help?