New Navigation Buttons

Long-lasting readers may have noticed a few minor tweaks over the past week or so to the main site – the background to the main text has been getting lighter, so that it has now actually become white. Also, I have added new navigation buttons:Click to View

What do you think? Are these useful navigation aids, Do they make the pages too slow to load (there should only be one new 4Kb image per page), or is it much as before?

Any feedback on the new look of the main shell tutorial is, as ever, greatly appreciated.