How Do I Make These Tabs?

http://fourclansrpg.proboards.com/index.cgi

I would like my website's news/general bar to be like there's, as well as my forum navigation. (When you click one of the tabs on the website in the picture, it changes the forum list.)

How would I go about this?

Hello,

I've got some HTML, CSS and Javascript codes, which you can use, but I don't know, if that's the same you would have in your forum. You can customize the codes and try, if that's as good as you would have.
I have to write the code of practise and I have to know, which version does your forum have.
Than I can give you an instruction and you can try it.