Performance tweaks

Heya!

Hope you're doing well - I have done a little tidying with this - added an image preload function too, so that the background pics are generated quickly. I would like to make it responsive so I have altered the css a little to allow that to happen in the near future - you can see this live at http://roidriscoll.co.uk (I have my blog hosted on Github pages now, so can use my old domain for experiments!)

Speak soon
Rx