function setHandler(){
	var d = document.getElementsByClassName('more', "div");
	for(var i=0; i<d.length; i++){
		Event.observe(d[i],"click",changeClass,true);
		d[i].className = 'less';
	}
}

function changeClass(e){
	var t = Event.element(e);
	var pr = t.parentNode;
	t.className = (t.className == 'more') ? 'less' : (t.className == 'less') ? 'more' : t.className;
	pr.className = (pr.className == 'more') ? 'less' : (pr.className == 'less') ? 'more' : pr.className;
}

Event.observe(window,"load",setHandler,true);