DBI script works on command line but not in browser

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

My DBI script works correctly when run by a web server, but I get syntax errors when running it from the command line (Perl 5 and FreeBSD server). Here's the code:

use DBI;
($db) = DBI->connect('DBI:mysql:DatabaseName, $dbusername);
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Here are the corresponding errors:

syntax error in file MyScript.cgi at line 66, next 2 tokens "use DBI" 
syntax error in file MyScript.cgi at line 82, next 2 tokens "->"
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What's the problem?

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