#header {
	z-index: 10;
	position: absolute;
	left: 50%;
	margin-left: -450px;
}

.menus {
	z-index: 10;
	position: absolute;
	top: 70px;	
	left: 50%;
	margin-left: -450px;
}

#page {
	z-index: 10;
	position: absolute;
	left: 50%;
	margin-left: -450px;
	top: 340px;
	clear: both;
}
#alta {
	width: 860px;
	text-align: left;
	padding: 20px;
	padding-top: 10px;
	background-color: #fff;
	border-top: 10px solid #fff;
	z-index: 10;
	position: absolute;
	left: 50%;
	margin-left: -450px;
	top: 495px;
	clear: both;
}