#body {
  margin: 0px;
  padding: 0px;
}

#wrapper
 { 
    float: left;
    width: 1275px;
    margin: 0 auto;
     background: #e7e2e2;
    border: 0px solid #666666;
}


#header
{
  float: left;
  margin: 0 auto;
  width: 1275px;
  background: #ffffff;
    
}
 
#leftcol {
  background: #f00;
  float: left;
  width: 150px;
  height: 500px;
}

}
#rightcol {
  background: #f00;
  float: left;
  width: 150px;
  height: 500px;
}

#content
{
  background: #fff;  
  float: left;
  margin: 0 auto;
  width: 810px;
  height: 4500px;
}

#advert
{
  float: left;
  background: #fdc20f;
  width: 300px;
  height: 100%;
}


#footer
{
  clear: both;
}

#menycontainer ul{float: left; margin-left: 0; padding-left: 0; font-size: 70%;}
#menycontainer li{display: inline;}
#menycontainer ul a{float: left; text-decoration: none; background: #CC9999; margin-right: 0.5em; padding: 0.3em 2em;} 

#menycontainer ul{ float: left; margin-left: 0; padding-left: 0; width: 100%; background: #CC9999; font-size: 70%;}
#menycontainer li{display: inline;}
#menycontainer ul a{float: left; text-decoration: none; padding: 0.3em 2em;} 

#menycontainer a:link{color: #ffffff;}
#menycontainer a:visited{color: #ffffff;}
#menycontainer a:hover{background: #996666;}
#menycontainer a#current{background: #FFCC66; color: #000000;} 

#menybox
{
  width: 145px;
  float: left;
  border: 1px solid;
  border-color: #aaab9c #333333 #333333 #aaab9c;
  margin: 0;
  padding: 0;
  font: 12px Tahoma, Arial, Helvetica, sans-serif;
  font-weight: bold;
}

#menybox ul
{
  list-style-type: none;
  margin: 0;
  padding: 0;
}

#menybox a, #menybox span
{
  display: block;
  height: 100%;
  padding: 5px 10px;
  border-right: 1px solid #aaab9c;
  border-bottom: 1px solid #aaab9c;
  background-color: #ffffff;
  color: #777777;
text-decoration: none;
}

#menybox a:hover, #menybox span#aktuell
{
  background-color: #e8e8e8;
  color: #333333;
}


#content
{
  margin-left: 5px; 
  margin-right: 5px; 
  float: left;
  width: 810px;
}

#advert
{
  float: left;
  width: 300px;
  
}


#footer
{
  clear: both;
}
background: white url("bg.jpg") repeat-y;

#advert div
{
  border: 1px solid blue;
  margin-bottom: 5px;

}

#advert div h2
{
  aligne; center; 
  background-color: blue;
  color: white;
  padding: 2px;
}

}

#advert div h3
{
  background-color: blue;
  color: white;
  padding: 2px;
}

#advert div p
{
  padding: 5px;
}

<div id="advert">
  <div>
    <p>
      <a>...