Ich benötige Hilfe mit meinem Css Code

h1#title{display: none;}

h2#title span {display: none;}

div.header{display: none;}

li.nav_element{list-style-type: none;}

body {background-image:url(http://img.webme.com/pic/l/lieblingsbuch-test/ii6.jpg);
background-position: center center;}

a{color:#ffffff font-size: 15px; text-decoration: none;}
a:hover {color: #ffffff; font-size: 15px; text-decoration: none;}
a:link {color: #ffffff; font-size: 15px; text-decoration: none;}
a:active {color: #ffffff; font-size: 15px; text-decoration: none;}
a:visited {color: #ffffff; font-size: 15px; text-decoration: none; }

li.nav_element a{
color:#C0C0C0;
display: block;
margin: 0px;
padding-left: 0px
text-decoration: none;
width: 150px;
height: 25px;
background-image:url(http://img.webme.com/pic/l/lieblingsbuch-test/unbenannt11aj8.png);
background-color:}

li.nav_element a:hover{
color:#C0C0C0;
display: block;
margin: 0px;
padding-left: 0px
text-decoration: none;
width: 150px;
height: 25px;
background-image:url(http://img.webme.com/pic/l/lieblingsbuch-test/1.png);
background-color:}
{ padding: 0; margin: 0; }


#Design {
margin: 0 auto;
width: 922px;
}

#nav_container {
width: 150px;
height: 500px;
background:;
background-image:url(http://img524.imageshack.us/img524/823/unbenannt16kb1.png);
color: ;
border: 1px solid #ffffff;
margin: 0px 0px 0px 0px;
padding: 10px;
float: left;overflow:auto;
position:absolute;left:40px;top:50px;}

#content {
height: 370px;
width: 710px;
background:;
background-image:url(http://img524.imageshack.us/img524/823/unbenannt16kb1.png);
color: #ffffff;
border: 1px solid #ffffff;
margin: 0px 0px 0px 0px;
padding: 10px;
display: inline;
float: left;
overflow:auto;
position:absolute;left:230px;top:180px;}


#header_container {
position: absolute;
left: 230px;
top:50px;
width: 446px;
height:110px;
background-color:#343434;
background-image:url(http://img.webme.com/pic/l/lieblingsbuch-test/popj.jpg);
color:#FFFFFF;
font-size:13px;
border: 1px solid #FFFFFF;}