if (document.images) {
  Huison = new Image(); Huison.src = "./images/Home_on.jpg"; Huisoff = new Image(); Huisoff.src = "./images/Home.jpg";
  Overonson = new Image(); Overonson.src = "./images/Overonszelf_on.jpg"; Overonsoff = new Image(); Overonsoff.src = "./images/Overonszelf.jpg";
  Cataloguson = new Image(); Cataloguson.src = "./images/Catalogus_on.jpg"; Catalogusoff = new Image(); Catalogusoff.src = "./images/Catalogus.jpg";
  Lokatieon = new Image(); Lokatieon.src = "./images/Lokatie_on.jpg"; Lokatieoff = new Image(); Lokatieoff.src = "./images/Lokatie.jpg";
  NLinkson = new Image(); NLinkson.src = "./images/NLinks_on.jpg"; NLinksoff = new Image(); NLinksoff.src = "./images/NLinks.jpg";
  Contactnlon = new Image(); Contactnlon.src = "./images/Contactnl_on.jpg"; Contactnloff = new Image(); Contactnloff.src = "./images/Contactnl.jpg";
  Kalenderon = new Image(); Kalenderon.src = "./images/Kalender_on.jpg"; Kalenderoff = new Image(); Kalenderoff.src = "./images/Kalender.jpg";

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function changeImages() {
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    for (var i=0; i<changeImages.arguments.length; i+=2) {
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}