I've experienced the same problem (you're using Firefox, right?)
Try typing:
http://www.btinternet.com/~general_z.../turtles27.jpg
and then change the number in this address from "turtles27.jpg" to "turtles28.jpg" and so on and so forth everytime you want to see next page.
I know this is a very slow way to read Tony's comic, but... at least effective
EDIT: Oh yeah, and page "turtles47.jpg" is the last one so far.