How to smoothly show a div by doing a scroll over page content
I have a web which shows information about a city. I would like to add a link at the top for showing/hiding a map of the city. When pressing the "show" link I would like the map to be shown progressively, i.e. by scrolling the bellow content and adding the map as if there was a powerpoint transition.
I think I have seen somewhere on a web. Is this possible ? Do you have an example for doing this ?