function nextGroup() {

	var back = document.getElementById('back');
	var more = document.getElementById('more');

	back.style.display = 'block';
	
	var groups = (document.getElementById('column2')).getElementsByTagName('UL');

	for (i=0;i<groups.length;i++)
	{
		groups[i].style.display = 'none';
		
		var newGroup = more.getAttribute("title");
		
		document.getElementById('group'+newGroup).style.display = 'block';
	}
	
	more.setAttribute("title", parseInt(more.getAttribute("title"))+1);
	back.setAttribute("title", parseInt(back.getAttribute("title"))+1);
	
	if (parseInt(more.getAttribute("title"))-1 == document.getElementById('column2').getAttribute("title"))
		more.style.display = 'none';
	
	return false;
}

function prevGroup() {

	var back = document.getElementById('back');
	var more = document.getElementById('more');

	more.style.display = 'block';
	
	var groups = (document.getElementById('column2')).getElementsByTagName('UL');

	for (i=0;i<groups.length;i++)
	{
		groups[i].style.display = 'none';
		
		var newGroup = back.getAttribute("title");
		
		document.getElementById('group'+newGroup).style.display = 'block';
	}
	
	more.setAttribute("title", parseInt(more.getAttribute("title"))-1);
	back.setAttribute("title", parseInt(back.getAttribute("title"))-1);
	
	
	if (back.getAttribute("title") == "0")
		back.style.display = 'none';

	return false;
}