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 X' S7 ~$ b  O1 v
公仔箱論壇1 R8 V+ N& g: |# I7 H6 g
thanks in advance.