Load Content 1 | Load Content 2 | Load Long Content | This 'id' is not in the case statement.

This is the content that will be visible at the very beginning.

Loading Please Wait...

I have just made a ZIP file with the code in it, apparently my website font screws up the text formatting characters.

Get all the code: Ajax PHP Content ZIP

View Source to get the full javascript & CSS code.
The loading indicator is from Ajaxload.info.