how to develop a gadget - collapsible panel

In this post, I will explain how to develop a gadget called collapible panel.

When you click the header region, the box will be collapsed or expanded. Here is how I develop this gadget.Collapible panel code
You might want to change the style yourself in order to make it suitable to your blogging. Another way is that you can make the style settings available to end users. For example, the header background color, header font, can be added to UserPref block.