I'm seeing this placement on a lot of sites lately. You can see, there is fixed vertical adsense unit at the right and it shows when you scroll down. http://www.jutarnji.hr/-sahranili-s...iva-13-dana-nakon-vlastitog-sprovoda/1121825/ Is this allowed by Google?
One of the other guys has posted on how to it on here. I think it maybe okay as you aren't doing anything to alter the code at all.