I'm sorry, I got confused.
If you're using Windows Authentication, you should create a Windows group and then create a Login for that group.
That way, you can manage the permissions as a group and you just have to do the job once.
Luis C.
General Disclaimer:
Are you seriously taking the advice and code from someone from the internet without testing it? Do you at least understand it? Or can it easily kill your server?
How to post data/code on a forum to get the best help: Option 1 / Option 2