function swap_picture(image_name, swap){
  document.images[image_name].src = "images/" + swap + ".jpg";
}

xAddEventListener(window, "load", setContent);
xAddEventListener(window, "resize", setContent);

function setContent() {

  var content = xHeight("header") + xHeight("footer") + 10;

  if((xHeight("content") + content) < xClientHeight())
    xHeight("content", (xClientHeight() - content));
}

function popupRoute() {
  window.open('http://tools.locatienet.com/location/map.asp?config_id=5024&language=dutch&street=Willem+Sophiaplein&zipcode=6466+CP&city=Kerkrade&country=NL&zoom=7&markertext=Willem+Sophiaplein+4&css=http://www.angstvoortandarts.nl/style.css','planner','width=615,height=400,menubar=no,scrollbars=no,toolbar=no,location=no,directories=no,resizable=no,top=115,left=55');
  return false;
}

function showGoudenGids() {
  window.open('http://www.worldclip.nl/webtv/91/clipdeck.php?clipcode=19975&taal_id=1','goudengids','width=760,height=490,menubar=no,scrollbars=no,toolbar=no,location=no,directories=no,resizable=no,top=115,left=55');
  return false;
}