是否可以使用ajax/jquery技术预加载页面内容?

Is it possible to preload all page contents (like showing a loading bar / animated gif.. or loading text.. ) until the contents are fully loaded and then displayed to the user/visitor ? If this is possible, can you give me just directions or resources to follow to achieve this. Because I was able to find image preloaders easily, but I am seeking for a preloading technique that will preload all content on the page before being displayed.Is it possible to preload all page contents (li