#container {
  background-color: #eee;
  width:1300px;
  margin-right:auto;
  margin-left:auto;
}

#header {
  background-color:#222;
  padding:10px;
  color: #fff;
  font-family: Verdana;
  text-align:center;

}

#nav {
  width:180px;
  min-height:500px;
  background-color:#c38aff;
  padding:10px;
  float:left;
}
#content {
  width:920px;
  min-height:500px;
  background-color:#ffffa4;
  line-height:20px;
  padding:10px;
  float:left;
}

#ad {
   width:140px;
   min-height:500px;
   background-color:#79fbff;
   padding:10px;
   text-align:center;
   line-height:30px;
   float:left;
}

#footer {
  clear:both;
  background-color:#222;
  color: #fff;
  font-family: Verdana;
  text-align:center;
  padding:10px;
}