help plz: joining subtiles for cd1 & cd2 to for 1 big file

[uk_dan2k]

hi, i've got a film split on 2 avi files, with subtiles of .idx and .sub.

Now i've joined to 2 avi files as 1 and converted it into a dvd,
i've got my video steam and audio stream ready for muxing to make the dvd.

but was wondering if i can join cd1 & cd2 subtitles somehow and then add them onto the dvd.

thanks for the help!

[nikmabc]

vobsub has a joiner program and there is a doom guide with info.

http://www.doom9.org/index.html?/mpg/avi2dvdr.htm