a.img_roll:link, .img_roll{
	width:28px;
	height:28px;
	display:block;
	background-image:url(http://www.chan961.net/images/additional_close.png);
}
a.img_roll:hover{
	width:28px;
	height:28px;
	display:block;
	background-image:url(http://www.chan961.net/images/additional_close2.png);
}