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 ?  
1 n+ O! P; L; [) L" a, |公仔箱論壇. G$ D, c" l/ h2 ]! [% I9 l
thanks in advance.