#top_menu {
	display: block;
	padding: 0;
	margin: 0;
	text-indent: -9999px;
	margin-top: 15px;
}
#top_menu a.bt1 {
	display: block;
	width: 300px;
	height: 91px;
	background: url(../img/top/bt1.gif) no-repeat top left;
	float: left;
}
#top_menu a.bt2 {
	display: block;
	width: 300px;
	height: 91px;
	background: url(../img/top/bt2.gif) no-repeat top left;
	float: left;
}
#top_menu a.bt3 {
	display: block;
	width: 300px;
	height: 91px;
	background: url(../img/top/bt3.gif) no-repeat top left;
	float: right;
}
#top_menu a:hover {
	background-position: 0 -91px;
}