Gone all AJAX

Well not all AJAX, but a bit here and there. I do try and keep up with modern times!

For long articles featured on the home page, the body of the article can be loaded into the page by clicking the little down arrow to the right of the title. I've even added a Facebook-style animated gif, which appears while the article is loading.

Note: I've changed this slightly, removing the arrows on the right in favour of a simpler "Read article..." link.