Hm, I created some sort of frame (but in fact it is not a real frame) here:

http://www.hitechweb.genezis.eu/furd.../prototype.htm

I modified the parameters of the "body" of the file, it means set the dimensions and define the color (dark grey), that is different from the background (black). But you cant do the same with the Template 9, because if you set the different colours for the background and the body, the colour of the background affects (I think) also the background on the place, where are the buttons and the news.

If you want to do this, I recommend you to set the solid width of the web page content with some defined colour and have the variable size (depending on the monitor resolution) background.