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David, a "return false" is missing for some browser. A timeout too (recommanded by Google in order to save all tracked event):

Try this:

Bla Bla

And add in header this javascript function:

function v_ls(link, category, action) {

try {var myTracker=_gat._getTrackerByName();_gaq.push(['myTracker._trackEvent', category , action ]);setTimeout('document.location = "' + link.href + '"', 100)}catch(err){}};