Implementing Who's Online Code (ASP)

how 2 implement who’s Online code in my website?

My Website is Membership based.

How Can i show the Names of Member (or say Member iD), those who are currently online.

at present i am drowned in Code, which i got from

http://www.asp101.com/articles/john/activeusers/active_users_2.asp

Help me Out

Thanx in advance