Memory problem or how to unload pages

Memory problem or how to unload pages

Hello

In JQM style we can load pages dynamicly and it does work well.
But we can have another problem.
Web application can have many many pages.
So we load, load, load , load ... iPad is not so cool device as thinks billions users in the world. Really it is very slow.
At some moment we overload memory and device will be very slow.
So any ideas how to unload pages from the memory? Any stragy how to manage memory of web application?