if (document.images) {
  Homeon = new Image(); Homeon.src = "images/homeON.jpg"; Homeoff = new Image(); Homeoff.src = "images/home.jpg";
  Contactuson = new Image(); Contactuson.src = "images/contactON.jpg"; Contactusoff = new Image(); Contactusoff.src = "images/contactus.jpg";
  Sitemapon = new Image(); Sitemapon.src = "images/sitemapON.jpg"; Sitemapoff = new Image(); Sitemapoff.src = "images/sitemap.jpg";

  Overonson = new Image(); Overonson.src = "images/overons_on.jpg"; Overonsoff = new Image(); Overonsoff.src = "images/overons.jpg";
  Dienstenon = new Image(); Dienstenon.src = "images/diensten_on.jpg"; Dienstenoff = new Image(); Dienstenoff.src = "images/diensten.jpg";
  Porton = new Image(); Porton.src = "images/portfolio_on.jpg"; Portoff = new Image(); Portoff.src = "images/portfolio.jpg";
  Contacton = new Image(); Contacton.src = "images/contact_on.jpg"; Contactoff = new Image(); Contactoff.src = "images/contact.jpg";
} 
function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}
function NewWindow(mypage, myname, w, h, scroll) {
var winleft = (screen.width - w) / 2.7;
winprops = 'height='+h+',width='+w+',top='+0.0+',left='+winleft+',scrollbars='+scroll+',resizable,toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes'
win = window.open(mypage, myname, winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}
function clearField(object) {
object.value ="";
}