Coding Showing on Published Pages

Curious about what might have led to the following code showing up on my published pages at the top of each one, and how to make it disappear again!

_gaq.push([‘_trackPageview’]); (function() { var ga = document.createElement(‘script’); ga.type = ‘text/javascript’; ga.async = true; ga.src = (‘https:’ == document.location.protocol ? ‘https://ssl’ : ‘https://www’) + ‘.google-analytics.com/ga.js’; (document.getElementsByTagName(‘head’)[0] || document.getElementsByTagName(‘body’)[0]).appendChild(ga); })();

Thanks for any guidance!