To combine scripts and (self-written) modules in relative directories, I like to do something like the following:

BEGIN {
  use FindBin qw($Bin);  # get actual path of this script
  use lib "$Bin/../lib"; # add path/../lib/ to @INC
  use ModuleXY;          # load module ModuleXY.pm from lib
} # BEGIN
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e.g. if a script is in .../myScript/bin/ and the modules are in .../myScript/lib/

I use it a lot unter Win2k, Linux and Solaris, and it works great.

Best regards,
perl -e "s>>*F>e=>y)\*martinF)stronat)=>print,print v8.8.8.32.11.32"