First, I am not a developer, so please have some patience. Here's what I need help with. 
My objective is to report on Salesforce User Activities and PageViews inside of Google Analytics.

I downloaded the WebAnalytics addon from the Appexchange https://appexchange.salesforce.com/listingDetail?listingId=a0N300000016cuSEAQ
and got it installed and working. I realize that this uses S Controls which are no longer supported, but they still work. 
I am able to track usage but all the data is showing by Client ID.


What I would like to do is convert this to a Salesforce User. I am only tracking 12 sales reps, so I would be open to some way to substitute the Client ID for the Username. The other option is to add some code to the script to capture the user name. 
I am already capturing the "transactions" with this line
var pageTracker = _gat._getTracker("UA-8953xxxx-1");

so I need to create another line of code that's something like:
ClientID = User First Name + User Last Name

I don't know javascript, so if someone could just give me the correct syntax, that would be much appreciated.
Thanks in advance