Here is an attempt on my part to insert a link using the IMG button:
Which appears to work. In Firefox, I see the two images at the top and my own image but nothing in between. In IE I see broken tags in between.
So, I pulled the properties of one of the images and got the URL, http://mtnbiker.smugmug.com/photos/199525292-M-1.jpg, when I try to bring that up directly I find that the site has been blocked by my employer’s firewall. So, that seems to answer my issue, at least.
You may note in my image if you look at the properties, I’m using farm2.static.flickr.com instead of the http://www.flickr.com domain, again because my employer has blocked Flicker directly but has left the side door open.