ein-verzweifelter: ie zeigt keine Hintergrundbilder

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Danke für eure Antworten.

Dann poste ich mal den gesamten Code.

hier das ganze HTML:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">

<head>  
	<title></title>  
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
	<meta name="description" content="" />  
	<meta name="keywords" content="" />  

	  
	<link rel="stylesheet" href="css/main.css" type="text/css" />  
	<!--[if lt IE 8]><style type="text/css">@import url(css/ie7.css);</style><![endif]-->  
	<script src="js/jquery-cycle.js" language="javascript" type="text/javascript"></script>  
</head>  

<body>  
	<div class="trenner-oben"></div>  
	<div id="wrapper">	  
		<div id="logo"><a href="index.html"><img src="layout/logo.png" alt="Logo" /></a> </div>  
		<ul id="menu">  
			<li><a href="index.html">Home</a></li>  
			<li class="aktuell">Collection</li>						  
			<li><a href="kontakt.php">Contact</a></li>  
			<li><a href="impressum.html">Impressum</a></li>  
		</ul>	  
		<div class="clearer"> </div>  
		  
		<div id="seite">		  
		  <div id="slider">  
			<div class="nav">  
				<a id="prev" href="#"></a>  
				<a id="next" href="#"></a>  
			</div>  
			<ul>  
				<li><img src="Bilder/bild1.png"  width="900" height="700" alt="bildeins" /></li>  
				<li><img src="Bilder/bild2.jpg" width="900" height="700" alt="bildeins" /></li>  
			</ul>  
		  </div>  
		  <div id="schatten"></div>  
		</div>  
	</div>  
</body>  

</html>

und das wesentliche CSS:
#wrapper{
margin: 0px auto 30px;
width: 1000px;
overflow: hidden;
position: relative;
padding-top: 30px;
}
#seite {
overflow:hidden;
position: relative;
margin-top: 45px;
}
#slider {
margin-left: 50px;
width: 900px;
height: 700px;
background: transparent url(../layout/bg-slider.jpg) no-repeat 0 0;
}

Hoffe Ihr könnt mir helfen :)