@ Charyb
The reason Tech posted that was nothing to do with security, but that imageshack.us seems to block access to the images for certain non-us geographical locations. So images aren't displayed.
I just visited both links you mentioned, I got no popup wanting to download anything and displayed the two images referred to in the topic.
I use firefox with NoScript and RequestPolicy, so that would provide a degree of extra protection, but selectively allowing some of the script and cross site stuff, still no pop-up or complaint from avast. So I don't know if this happened to be directly the reason for the fake alert.
Site advisor is notorious for way out of date reviews.