function toggleAdvance() {
	var advance = document.getElementById('advance');
	var showAll = document.getElementById('showAll');
	var hideAll = document.getElementById('hideAll');
	if(advance.style.visibility == 'hidden') {
		advance.style.visibility = 'visible';
		advance.style.display = 'inline';
		
		showAll.style.visibility = 'hidden';
		showAll.style.display = 'none';
		
		hideAll.style.visibility = 'visible';
		hideAll.style.display = 'inline';
		
	}
	else {
		advance.style.visibility = 'hidden';
		advance.style.display = 'none';
		
		showAll.style.visibility = 'visible';
		showAll.style.display = 'inline';
		
		hideAll.style.visibility = 'hidden';
		hideAll.style.display = 'none';
	}
}