span#title1 a {
	display: block;
	overflow: hidden;
	text-indent: -9999px;
	width: 93px;
	height: 48px;
	background-image: url("images/a_01.jpg");
}
span#title1 a:hover {
	background-image: url("images/aov_01.jpg");
}
span#title2 a {
	display: block;
	overflow: hidden;
	text-indent: -9999px;
	width: 141px;
	height: 48px;
	background-image: url("images/a_02.jpg");
}
span#title2 a:hover {
	background-image: url("images/aov_02.jpg");
}
span#title3 a {
	display: block;
	overflow: hidden;
	text-indent: -9999px;
	width: 142px;
	height: 48px;
	background-image: url("images/a_03.jpg");
}
span#title3 a:hover {
	background-image: url("images/aov_03.jpg");
}
span#title4 a {
	display: block;
	overflow: hidden;
	text-indent: -9999px;
	width: 194px;
	height: 48px;
	background-image: url("images/a_04.jpg");
}
span#title4 a:hover {
	background-image: url("images/aov_04.jpg");
}