请问怎样用subtitile的file (sub) ??

alantct

i hv a movie file, Lelio.Po.Po.2010.DVDRip.XviD.ONiE and another two files (seprate) is the sub  & idx file. may i know how to use or combine the video file so that i can watch it with subtitle ?  公仔箱論壇7 ~5 C2 s& h: E8 A4 e9 q/ }
公仔箱論壇, [/ @  n. c7 N: b
thanks in advance.