Untitled

/*CSS PART*/
.wrapper2 {
    width: 800px;
    overflow: hidden;
    margin: 0 auto;
}
#content {
    background-color: #CCC;
    border: 1px solid #FFF;
    width: 590px;
    float: right;
}
#ad {
    background-color: #CCC;
    border: 1px solid #FFF;
    width: 200px;
    float: left;
}
/*CSS OVER*/

/*HTML TIME*/
<html>
<body>
<center>
<div class="wrapper2">
    <div id="content">something</div>
    <div id="ad">ADS WOOOOO</div>
</div>
</center>
</body>
</html>