picture popup of original version does not work

Hi,

I just noticed that the popup of the original version of the pictures on my blog does not work anymore.

The popup of the postcover works but within the entry itself the pictures don't pop up; for example on this page:

http://www.tillahrens.de/till-ahrens-blog/entry/der-riesenbuddha-von-leshan.html

See picture attached.

Thanks!