I would do something like this:

I did in this way ( http://jsfiddle.net/K5KjY/ ):
CSS:
#container{
width: 970px;
margin: 0px auto;
}
#backdrop-slider img{
position: fixed; /* <---- Problem should be here! */
left: 0;
right: 0;
margin: 0px;
width: 100%;
height: 200px;
}
#content{
margin-top: 250px;
width: 100%
}
HTML:
<body lang="en">
<div id="container">
<div id="header">
<h1>TITLE</h1>
<div id="backdrop-slider">
<img src="http://cf2.imgobject.com/t/p/original/fI3ucpgaVKOUcQ82vhgWmWuLlg2.jpg">
</div>
</div>
<div id="content">
<div id="switcher">
<p>
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</p>
</div>
<div id="covers">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
<img src="http://cf2.imgobject.com/t/p/w185/zh9DXJhBdHVVaWiDURTipADamcK.jpg">
</div>
</div>
</div>
</body>
But, in this way, if I scroll down I’ll get this:

I would that “backdrop-slider” goes up while scrolling down
Add
z-index:-1;for the background image. (or positive index for the content)http://jsfiddle.net/K5KjY/4/
Also, if you want the div to disappear when scrolling use
position:absolute;instead of fixed.