function change(_event)
{
	var target=_event;
	target=target.parentNode.parentNode;

	if (hasClass(target,'open')){
	  removeClass(target,'open')
		addClass(target,'closed')
	}else if (hasClass(target,'closed')){
	  removeClass(target,'closed')
		addClass(target,'open')
	}
}

function hasClass(ele,cls) {
	return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
function addClass(ele,cls) {
	if (!this.hasClass(ele,cls)) ele.className += " "+cls;
}
function removeClass(ele,cls) {
	if (hasClass(ele,cls)) {
		var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
		ele.className=ele.className.replace(reg,' ');
	}
}