When you group objects, if they overlap, one of the following things will happen:
- If both objects are the same size and in exactly the same position, a "rollover" will be created, where the image will change when you move the mouse over it.
- If at least one of the objects is an image and they overlap, all the objects are combined into a single image. If there are scripts attached to the objects, the scripts will not be used.
- If the top-most object has a script attached to it, and the objects overlap, the script will appear in the site, but the other objects in the group may not.