#header {
  background: #FFFFFF; 
  position: absolute;
  float: top;
  top: 0px;
  left: 0px;
  width: 900px;
  height: 362px;
  border-width: 1px;
  border-style: solid;
  border-color: #000000;
}
#topmenu {
  background: #183A44;
  position: absolute;
  top: 372px;
  left: 160px;
  width: 740px;
  height: 40px;
  border-width: 1px;
  border-style: solid;
  border-color: #000000;
}

#leftmenu {
  background: #183a44;
  position: absolute;
  top: 372px;
  left: 0px;
  width: 150px;
  height: 400px;  
  font-size: 20px;  
  border-width: 1px;
  border-style: solid;
  border-color: #000000;
}

#content {
  background: #FFFFFF;  
  position: absolute;
  top: 422px;
  left: 160px;
  width: 740px;  
  height: auto;  
  border-width: 1px;
  border-style: solid;
  border-color: #000000;
}