if (document.images) {

  image1on = new Image();
  image1on.src = "_images/new/g1_n.gif";

  image2on = new Image();
  image2on.src = "_images/new/g2_n.gif";

  image3on = new Image();
  image3on.src = "_images/new/g3_n.gif";

  image4on = new Image();
  image4on.src = "_images/new/g4_n.gif";

  image5on = new Image();
  image5on.src = "_images/new/g5_n.gif";

  image6on = new Image();
  image6on.src = "_images/new/g6_n.gif";

  image7on = new Image();
  image7on.src = "_images/new/g7_n.gif";

  image8on = new Image();
  image8on.src = "_images/new/g8_n.gif";

}
        function setRegio(r){
                changeimages('image1', 'image'+r+'on');
                document.kzoeken.gebied.value = r;
        }
        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");
                        }
                }
        }