html,body {
	border: 0;
	margin: 0;
	height: 100%;
	width: 100%;
}

#center {
	width: 900px;
	margin: auto;
}

#header, #sidebar-left, #sidebar-right, #content, #footer {
	border: none;
	padding: 0px;
}
#sidebar-left {
	margin-right: 10px;	z-index: 100;
}
#sidebar-right {
	margin-left: 10px;
}

#sidebar-left, #sidebar-right {
	margin-top: 10px;
	float: left;
	width: 20%;
}

#content {
	margin: 10px 5px;
	width: 52%;
	float: left;	z-index:50;
}

#header, #footer {
	clear: both;
}