how to use the second subtile by vsfilter?

[grantpu]

In my dvd source,title 00 is chinese,01 is english.

my script:
LoadPlugin("f:\plug\MPEG2DEC3.DLL")
LoadPlugin("f:\plug\vsfilter.DLL")
video=mpeg2source("f:\MEDIA\dvd.D2V")
audio=wavsource("f:\media\1_2_db.WAV")
audiodub(video,audio)
vobsub("f:\media\VTS_01_0.sub")

I only can get the chinese subtile,how to make the 01 english one?
is there any parameter for vobsub?

[grantpu]

open the .idx file created by vobsub
there are some lines like this

# Language index in use
langidx: 0

# English
id: en, index: 1

what we should do is to change it to:
# Language index in use
langidx: 1

# English
id: en, index: 1

so what we changed is from langidx:0 to langidx:1