/** * Activate a content part of the Accordion programmatically with the position zero-based index. * * If the index is not specified, it defaults to zero, if it is an invalid index, eg. a string, * nothing happens. * * @example $('#accordion').activate(1); * @desc Activate the second content of the Accordion contained in <div id="accordion">. * @example $('#nav').activate(); * @desc Activate the first content of the Accordion contained in <ul id="nav">. * * @param Number index (optional) An Integer specifying the zero-based index of the content to be * activated. Default: 0 * @type jQuery * * @name activate * @cat Plugins/Accordion * @author Jörn Zaefferer (http://bassistance.de) */