function tree() {
	var links = document.getElementById('tree').getElementsByTagName('a');
	for(var i=0; i<links.length; i++) {
		addEvent(links[i], 'click', treeOpen);
		links[i].title = 'Kinyit';
	}
}

function treeOpen(ev) {
	ev || (ev = window.event);
	var obj;
  	obj=getObjectOfEvent(ev);
  	if (!obj) {return true;}
	
	var ul = obj.parentNode.getElementsByTagName('ul')[0];
	if (ul.className == 'hide') {
		ul.className 	= '';
		obj.title		= 'Becsuk';
	} else {
		ul.className 	= 'hide';
		obj.title		= 'Kinyit';
	}
	killEvent(ev);
	return false;
}