<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
      var voorrek = "";
      var tussrek = "";
      var achtrek = "";
      var woonrek = "";

      function InitSaveVariables(form) {
        voorrek = form.voorrek.value;
        tussrek = form.tussrek.value;
        achtrek = form.achtrek.value;
        woonrek = form.woonrek.value;}

      function adrnaarrek(form) {
      if (form.copy.checked) {
        InitSaveVariables(form);
        form.voorrek.value = form.voorl.value;
        form.tussrek.value = form.tussen.value;
        form.achtrek.value = form.OUJKo6.value;
        form.woonrek.value = form.woonpl.value;}
      else {
       form.voorrek.value = voorrek;
       form.tussrek.value = tussrek;
       form.achtrek.value = achtrek;
       form.woonrek.value = woonrek;}
      }