<a href=”http://www.volkstanz.st/?pk_campaign=bre201307&pk_kwd=banner”><img class=”alignnone” alt=”ARGE Volkstanz Steiermark” src=”http://www.volkstanz.st/b/” width=”200″ height=”43″ /></a>
Credit http://khromov.wordpress.com/2011/11/10/collect-visitor-stats-using-any-image-with-the-piwik-tracking-api/