I am having some issues finding a decent tutorial for generating a loading style screen with regards to HTML5. To be quite honest I\'m not sure exactly where to begin...
This website is excellent for animated loading gifs: http://ajaxload.info/. An overlay can be used to display the image and also prevent interaction with the page while it is loading. You can use a div, position it above everything else (z-index) and set the width and height to 100%.