if your subtitles are earlier than they should, you can use a .bsi file and
in
[Subtitles]
...
startTime=the advance the subtitles have on the movie.
or maybe use
subDelay=number of frames early.
if it's another problem ( subtitles are late ), it's much easier to dl another sub file and try it.
try divxsubtitles.net
or a french site
http://divx.zemeilleur.com
hope it helps.