How can I make my website update itself automatically?

I'm creating a simple website. It will be a single page with a photograph and a block of text. I will need to update it with a new photograph and a new block of text at a certain time each day, say midnight. I anticipate being able to do this manually most of the time, but would like an option to somehow pre-load at least one photo and text block and have the site automatically update if needed. It would also be great to have multiple days' worth ready to go without human intervention. [more inside]
posted by The Deej on Jan 17, 2013 - 9 answers