How to preload a entire website like Gmail?

Question

How to preload the entire website like gmail does? How to show this in progress bar? What are the mechanisms used to get this effect?

I can use jquery, jquery UI, php. Will this be enought to create this?

Answer 1

I'm quite sure Gmail is built using the Google Web Toolkit, which essentially means that your whole application is contained in JavaScript files.. in fact the initial page source of Gmail is practically empty. This post will probably help: http://stackoverflow.com/questions/624891/gmail-like-file-upload-progress-bar-with-gwt