Select your browsertype below:

My browser is HTML5 compatible
and uses iframes

My browser is HTML4 compatible
or prefers framesets

If you are not sure, choose HTML5, otherwise or if you have a rather old browser or you know it has limited CSS functionality, you should select HTML4. For instance, Netsurf before version 3.0 requires frameset. In the next pages, you can always switch to the other with the link in the top right.