When you first load up the page Google Mars is broken...

google.com/mars/

it kind of works after you click on the zoom bar on the left. But the "link to this page" is also broken. Bit unlike Google to have such poor coding.

Has it always been like this? Or maybe it's getting an update due to new available images?

news.bbc.co.uk/1/hi/sci/tech/4 ...

Also noticed that none of the links at the top work either.
e.g: Mountains, Plains, Spacecraft, Canyons etc..

Yep, same here.