Matt's Web Development Blog had published an article that explains how to show and hide content, like many pages you've probably visited web pages that use a small plus (+) and a small minus (-).

Typically, these work by clicking on the plus sign to expand your view of some data then clicking on the minus sign to hide it again.


This is a useful technique for displaying large amounts of data, allowing the user to decide on just how much detail they wish to see.

Find it here