Change is the google adsense?

I was looking at this page.
http://forum.com.np Generally, I do not click in the picture ads by google adsense. But look at that banner in the left side of the forum. Where is "ads by google" lable? Did google removed that from the code? or the site is cheating over google? I've seen two more nepali sites which do not have the tag "ads by google" in image adsense ad. But I didnt see that in the site outside of nepal. I am confused really.