I just tried it again, and it seems to work.
I use a standard PC, XP, Mozzilla Firefox browser. I don't know if the link is dependent on the browser, being Firefox, or IE. I don't use IE anymore, and I have not tried the link with IE.
The way it works for me, with XP and Firefox, is
put the mouse on the red highlighted url above in the original post, and left click.
On my computer, it automatically opens a new window (Firefox tab), and the web site.
Another way to get there, is to go to
http://www.smart.com
Once there, click on the country, UK
Then, move the mouse to smart fortwo,
then slide the mouse down and over, and click on cabrio.
On that new page, move the mouse down and click on design.
Then, move the mouse under design, and click on interior.
And you should be there.
Click in the center of the interior photo, hold down the mouse clicker (I cant recall if its the right or left clicker on the mouse), and slowly drag the mouse around. The photo should move depending on if you go up, down, or side to side.
I re-tried all the above tonight using my computer with XP and Firefox, and it seems to be working.