Getting Correct Logged in UserID

I want to get the AuthorID of the logged in user. Actually I am facing strange problem. I am using forum code in the mini Search engine of wwf and I restricted users so that they can't add URL without first logging in as follows

'add_url_form.asp page code

If intGroupID = 2 Then
     Response.Write vbCrLf & strTxtInsufficientPermison
Else
    Display add URL form
End If

and in add_url.asp page I save logged in user ID like this

rsAddURL.AddNew
rsAddURL.Fields("Author_ID") = CLng(lngLoggedInUserID)
rsAddURL.Update

When I insert a URL, it saves my correct Author_ID where as when another user save, it save "2" for Author_ID.

Can anyone help me how it is going like this.