Would you be able to clear that up, i cant really understand what you are trying to ask :-\
The file you have here is loading the content in, and when a button is clicked the contents slides out and then slides in the new content.
Hmmm after reading your question again , are you asking that you basically want when you click on a button that the old content will slide out and the new content slide in without a preloader or having the new content already preloaded?