div.main_top {
	margin: 0px 0px 0px 15px;
	padding: 0px;
	text-align:left;
	clear: both;
}

div.top_left {
	margin: 0px;
	padding: 0px;
	width: 300px;
	float: left;
}

div.top_right {
	margin: 0px;
	padding: 0px;
	width: 545px;
	float: left;
}

div.top_img {
	margin: 7px 0px 0px 0px;
	padding: 0px;
	width: 545px;
	clear: both;
}



div.top_btn {
	margin: 0px;
	padding: 0px;
	width: 280px;
	text-align: left;
}

div.top_btn ul {
	margin: 0px;
	padding: 0px;
	list-style: none;
}

div.top_btn ul li {
	list-style-type: none;
	position: relative;
}

div.top_btn ul li a {
	display: block;
	text-decoration: none;
	padding: 0px;
	width: 280px;
}

div.top_btn li.life a { background: url(../eng/img/home/btn_life.jpg) no-repeat 0px 0px; width: 280px; height: 48px; text-indent: -9999px; }
div.top_btn li.material a { background: url(../eng/img/home/btn_materials.jpg) no-repeat 0px 0px; width: 280px; height: 48px; text-indent: -9999px; }

div.top_btn li.life a:hover { background: url(../eng/img/home/btn_life.jpg) no-repeat -280px 0px; width: 280px; height: 48px; text-indent: -9999px; }
div.top_btn li.material a:hover { background: url(../eng/img/home/btn_materials.jpg) no-repeat -280px 0px; width: 280px; height: 48px; text-indent: -9999px; }