Welcome to the demo!.This is Layer1. When you load this page you can view this. Once if you mover your mouse over any of this images, this layer will be hiddden.
Layer2: Now you are moving your mouse over image 1. When you move out again Layer 1(default) will appear.
Now you are viewing layer three as your are moving your mouse over the image2. Now too you will get the default layer(Layer1) if you move the mouse out. Enjoy!