Css Tasarım Kodlama

<div id="tasarim">
<div id="ust"></div>
<div id="orta">
<div class="solsutun">BURASI SOL MENÜ</div>
<div class="sagsutun">

</div>
</div>
<div id="alt"></div>
</div>

h1#title { display: none; }
h2#title span { display: none; }
div.header { display: none; }
li.nav_element { list-style-type: none; }
li.nav_element { display: none; }

table {margin-left: auto;margin-right: auto}

* {padding: 0; margin:0 }

body {
margin-left: auto;
margin-right: auto;
background-color: #FFF ;

}

#tasarim{
width: 950px;
margin-left: auto;
margin-right: auto;
}

#ust{
margin-left: auto;
margin-right: auto;
background: url(http://img145.imageshack.us/img145/2454/headeryi.png);
width: 950px;
height: 248px;
float: left;
}

#orta{
margin-left: auto;
margin-right: auto;
background: url(http://img685.imageshack.us/img685/7372/orta.png);
width: 950px;
height: 100%;
float: left;
}

.solsutun{
width:137px;
float: left;
padding: 0 0 0 20px;
overflow: hidden;
}

.sagsutun {
width:740px;
float: left;
padding: 0 0 0 30px;
overflow: hidden;
text-align: justify;
}


#alt{
margin-left: 0 auto;
margin-right:0 auto;
background: url(http://img251.imageshack.us/img251/20/footerej.png);
width: 950px;
height: 66px;
float: left;
}

#alt{
margin-left: 0 auto;
margin-right:0 auto;
background: url(http://img251.imageshack.us/img251/20/footerej.png);
width: 950px;
height: 66px;
float: left;
}