iframe {
  border: none;
  overflow-x: hidden;
}
.startpagina {
  background-attachment: fixed;
  background-image: url(images/lotte-heide.jpg);
  background-repeat: no-repeat;
  background-position: center top;
  position: absolute;
  left: 50%;
  margin-left: -500px; /* (width/2) zorgt er icm left en position voor dat je een gecentreerde floating box krijgt.*/
  width: 1000px;
  height: 100%;
  z-index: 1;
}
.startpagina a {
  position: absolute;
  top: 0;
  left: 0;
  width: 1000px;
  height: 100%;
}
.achtergrond {
  background-attachment: fixed;
  background-image: url(images/achtergrond.jpg);
  background-repeat: no-repeat;
  background-position: center top;
  position: absolute;
  left: 50%;
  margin-left: -500px; /* (width/2) zorgt er icm left en position voor dat je een gecentreerde floating box krijgt.*/
  width: 1000px;
  height: 100%;
  z-index: 1;
}
.hoofd {
  position: absolute;
  left: 200px;
  width: 800px;
  top: 142px;
  z-index: 3;
/*	background: #556652;
  background: #ffffff;
  filter: alpha(opacity=50);
  -moz-opacity: 0.50; */
}
.menu {
  position: absolute;
  width: 200px;
  top: 142px;
  z-index: 2;
}
#menu {
  width: 12em;
  font-family: arial;
  font-size: small;
}
#menu ul {
  margin-left: -40px;
  padding-left: 0px;
  list-style: none; 
}
#menu ul.submenu {
  margin-left: -30px;
  padding-left: 0px;
  display: none;
  font-family: arial;
  font-size: x-small;
}
#menu li a {
  display: block;
  padding: 5px 5px 5px 0.5em;
  color: black;
  text-decoration: none;
  width: 100%;
  font-weight: bold;
}
#menu li a:hover {
  font-weight: bold;
  font-style: italic;
}
#menu li {
  margin-left: 40px;
/*  border-top: 1px solid lightblue; */
}
#menu li.last {
/*  border-bottom: 1px solid lightblue; */
}