I see that you are using the old GA script tracking version (and not the new asynchronous version) and that you open the links in a new window (using target="_blank" in the <a> tag). Given this, you just need to add code to register pageviews when you click a link:
onClick="pageTracker._trackPageview('page_name');"
This will register a pageview with the page_name page that appears in the reports. This type of page view is called "virtual page view." Of course, you should choose the appropriate names for placement in reports based on where the links go. You could extract the names from the href link.
Note that another way to do this is to use event tracking instead of virtual page views, but the main idea will remain the same (call it in the onClick event). Different people have different opinions about which one to use, so you should read it to decide which is more useful for your situation.
Also note that if you did not open a new window / tab for the link, you will need to use a timeout to delay loading a new page for a few milliseconds until a tracking beacon is transmitted.
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