if (document.images) {
  healingon = new Image(); healingon.src = "images/fpageon_10.jpg"; healingoff = new Image(); healingoff.src = "images/fpage_10.jpg";
  cursuson = new Image(); cursuson.src = "images/fpageon_16.jpg"; cursusoff = new Image(); cursusoff.src = "images/fpage_16.jpg";
  celzoutenon = new Image(); celzoutenon.src = "images/fpageon_03.jpg"; celzoutenoff = new Image(); celzoutenoff.src = "images/fpage_03.jpg";
  coachingon = new Image(); coachingon.src = "images/fpageon_14.jpg"; coachingoff = new Image(); coachingoff.src = "images/fpage_14.jpg";
  opvoedingon = new Image(); opvoedingon.src = "images/fpageon_06.jpg"; opvoedingoff = new Image(); opvoedingoff.src = "images/fpage_06.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 clearField(object) {
object.value ="";
}