How to connect to ldap with domain name only

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Hi,

I need to connect to a ldap server (win 2k domain server) from a perl
script:

use Net::LDAP;
my $ldapServer = "ldap://my.ldap.hostname";;
my $ad = Net::LDAP->new($ldapServer) or die "Could not connect to ldap
'$ldapServer': $@";

This works fine if I use a (fully qualified) hostname (as above). But
if I use the name of the windows domain instead (as in a normal window
account "ourdomain\userid") I get this error:

IO::Socket::INET: Bad hostname 'ourdomain'

Funnily when my asp.net collegue uses the same connection-string/method
from within asp.net it works fine.

Now the question is, how can I connect to a ldap server when only the
domain-name (from the userid) is known?

Cheers, Ronald