iframe.contentframe {
  position: absolute;
  left:     180px;
  top:      115px;
  z-index:  1;
  border:   0px none;
  z-index:  6;
  width: 860px;
}
iframe.naviframe {
  border:     0px none;
  left:      10px;
  top:      140px;
  position: absolute;
  width:    165px;
  height:   500px;
  z-index:  5;
}