Ported new CSS into text and image display pages
Re-jigged the CSS for the text and image display pages so that it is built on top of Greg's CSS, and CSS lower in the hierarchy also maintains the same look and feel. For the text pages, it was fairly straightforward, but for the image pages we had to do a full redesign of the layout, and override the default menu placement and behaviour to keep it out of the way of the image. I think the results are pretty good. There's more to do with the menu, and with the search page and search results display, but we should get that finished tomorrow. Tested on FF, Opera, IE7 and Safari. I would like to make the annotation menu a little clearer too; the difference between the annotation category headers and their child annotation titles is not distinctive enough.