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Wow Ed, what an answer.

I pretty much agree with "are you selling less, do you have less subscriptions, are you getting less enquiries ?". Yes that's the real goal of our sites, not just traffic and ranks.

Thanks again for you reply.

I am gonna keep watching the site's performance and keep discussing.  

The "Audience --- Overview" contains every visits, of course including paid traffic. Unless you have set an advanced segment to filter the paid traffics

Hi Martijn,

Thanks for the reply.

After nearly 5 hours work, I have finally solved it out.

First I need to add

_gaq.push(['_setDomainName', 'none']);
_gaq.push(['_setAllowLinker', true]);

Then I also need add the onclick="_gaq.push(['_link', this.href]); return false;" on the link which point out to the transaction website.

I have tested and it worked, now I can check the keywords which bring me orders.

However, thanks for you reply.