[expert] Scripting- Uppercase to lowercase

[Dave A. Peat II]

Hello,
I am moving a website from NT/IIS to UNIX.  Can someone tell me of an easy way, 
possibly a script of some kind, to do two things:
1.  Change all file names (some are uppercase and some are lowercase) to ALL lowercase.
2.  Change all tags within htm files (<A HREF=...>) that is, the path and file name , 
to lowerecase.  For example, <A HREF="InfoSys/P_Directory/Index.htm"> to <A 
HREF="infosys/p_directory/index.htm">
Thanks in advance...
Dave