How do I merge two *.srt files

Please see this question. I have just merged two avi files cd1.avi and cd1.avi into movie.avi using: avimerge -o movie.avi -i cd{1,2}.avi Problem is that I had to *subtitle* files linked to the first avi files: cd1.srt cd2.srt At first I tried simply to concatenate the files together: cat cd{1,2}.srt > movie.srt But that caused havoc with the subtitles... any suggestions?