menu knop niet zichtbaar

<div id="header">
			<!--spanner-->
				<div id="menu">
					<a id="menu_home" href="index.htm"></a>
					<a id="menu_portfolio" href="portfolio.htm"></a>
					<a id="menu_about" href="about.htm"></a>
					<a id="menu_contact" href="contact.htm"></a>
				</div>
			</div>

<div id="header">
			<!--spanner-->
				<div id="menu">
					<a id="menu_home" href="index.htm"></a>
					<a id="menu_portfolio" href="portfolio.htm"></a>
					<a id="menu_about" href="about.htm"></a>
					<a id="menu_contact" href="contact.htm"></a>
				</div>
			</div>

/*!!!!!!!!!!!!Header!!!!!!!!!!!!*/
div#header{
	width:100%;
	height:210px;
	margin: 0 0 0 0;
	padding: 0 0 0 0;
	background-image: url('images/menu.jpg');
	background-color: #FFF;
	background-repeat: norepeat
}
/*!!!!!!!!!!!!Menu!!!!!!!!!!!!*/

div#menu{
	margin: 0 0 0 385px;
	width:200px;
	height:210px;
	background-color: #FFF;
}

a#menu_home{
	position: relative; 
	width:60px;
	height: 20px;
	top: 100px;
	background-image: url('images/menu_home.jpg');
}

a#menu_home:hover{
	background-image: url('images/menu_home_hover.jpg');
}

a#menu_portfolio{
	position: absolute;
	width:111px;
	height: 20px;
	background-image: url('images/menu_portfolio.jpg');
	top: 113px;
	right: 485px;
}

a#menu_portfolio:hover{
	background-image: url('images/menu_portfolio_hover.jpg');
}

/*!!!!!!!!!!!!Header!!!!!!!!!!!!*/
div#header{
	width:100%;
	height:210px;
	margin: 0 0 0 0;
	padding: 0 0 0 0;
	background-image: url('images/menu.jpg');
	background-color: #FFF;
	background-repeat: norepeat
}
/*!!!!!!!!!!!!Menu!!!!!!!!!!!!*/
 
div#menu{
	margin: 0 0 0 385px;
	width:200px;
	height:210px;
	background-color: #FFF;
}
 
a#menu_home{
	position: relative; 
	width:60px;
	height: 20px;
	top: 100px;
	background-image: url('images/menu_home.jpg');
}
 
a#menu_home:hover{
	background-image: url('images/menu_home_hover.jpg');
}
 
a#menu_portfolio{
	position: absolute;
	width:111px;
	height: 20px;
	background-image: url('images/menu_portfolio.jpg');
	top: 113px;
	right: 485px;
}
 
a#menu_portfolio:hover{
	background-image: url('images/menu_portfolio_hover.jpg');
}