var next = function(el) {
	var nextEl = el.nextSibling,
		needEl;
	while(nextEl) {
		if(nextEl.nodeType == 1) {
			needEl = nextEl;
		}
		nextEl = nextEl.nextSibling;
	}
	return needEl;
}

var click_handler = function(a) {
	(a.className == 'disabled')?(a.className = ''):(a.className = 'disabled');
	(next(a).style.display == 'block')?(next(a).style.display = 'none'):(next(a).style.display = 'block');
}