Toggle widget

1. initialize a toggle function by adding module ID
2. class name for trigger: toggle-trigger; class name for target panel: toggle-target
3. required YUI: yahoo-dom-event

config: {

parentnode:

[wrapping tag, wrapping classname],default:['span','toggle']

togglenode:

[toggle tag, toggle classname],default:['span','toggle-trigger']

switchclass:

[open className, close className],default:['on','off']

defclass:

default className,default:'off'

docclick:

whether or not to enable document click event for closing open panel, default:'false'

}