function nonestyle() {
	var chengelight=document.getElementById('light');
	chengelight.style.display = 'none';
	var chengefade=document.getElementById('fade');
	chengefade.style.display = 'none';
}
function imgset() {
	var chengelight=document.getElementById('light');
	chengelight.style.display = 'block';
	var chengefade=document.getElementById('fade');
	chengefade.style.display = 'block';
}