As Philip said, the page you showed...at least the pagination part of it...has *NOTHING* to do with JavaScript.
Didn't you notice the URL that is used when you click on one? For example
Code:
http://www.soothetube.com/page/4/
???
So that is sending *BACK* to the server *ASKING* for "/page/4".
More than likely, what is actually happening is that there is a URL REWRITE rule in place (look that up) and you are actually hitting something like
Code:
http://www.soothetube.com/index.php?page=4
(It's not exactly that...I tried it. But check out what happens if you use
Code:
http://www.soothetube.com/index.php?p=4
or
http://www.soothetube.com/index.php?p=17
or some other number
so I'm on the right track.)
So this is 100% server-side pagination. Period.