Using natbib in document:
; latex2html natbib.tex
[..]
Loading /home/syswis/breiter/packages/latex2html/l2h-devel981209/styles/texdefs.perl...
Loading /home/syswis/breiter/packages/latex2html/l2h-devel981209/styles/article.perl
Loading /home/syswis/breiter/packages/latex2html/l2h-devel981209/styles/natbib.perlsh:
syntax error at line 1: `do_real_harvarditem' unexpected
;
Simple example file attached.
Bernhard
natbib.tex