[Sisom]

Hi, I should have said to add this declaration block:
background: url("images/page_container.gif") repeat-y center top

As you aren't using the 2 column skin, it doesn't make sense to put it in the 2column folder. (It will still work fine either way, as long as you point to the correct URL).

In Firebug, do you not see any altskin.css styles? I would be very surprised if you didn't!

You can add it to the style in main.css and see if it works, but there will be a copy of the id selector and its style in altskin.css, which may override what you have put in main.css, but Firebug will tell you.