you are missing a bunch of variable names. Every time you see my there should be a variable name following. For example:
my ="/usr/local/apache/htdocs/projects/";
my ="http://mattwork.potsdam.edu/projects/";
should look like this line does
my @dirs=readdir PRJD;
add the following to the top of your script and you will get more helpful error messages
#!/usr/bin/perl
use warnings
use strict
check out this book (Learning Perl) by our own merlyn for a good place to start with perl.
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