// ======== popup functions ===============================
    img_win = null;
    win = null;

    function img_popup(img, img_w, img_h) {
      img_win = null;
      if(!img || !img_w || !img_h) { return true; }
      var href;
      href = img.getAttribute("href");
      if(!href) { return true; }
      img_w += 10; img_h += 10;
      var winprops = 'height='+ img_h + ',width=' + img_w +
        ',scrollbars=yes,resizable=yes';
      img_win = window.open(href, "prod_picture", winprops);
      if(img_win) { img_win.focus(); }
      return false;
    }

    function page_popup(a, title, w, h, url) {
      win = null;
      if(!a || !w || !h) { return true; }
      var href;
      if(url) {
        href = url;
      } else {
        href = img.getAttribute("href");
      }
      if(!href) { return true; }
      var winprops = 'height='+ h + ',width=' + w +
        ',scrollbars=yes,resizable=yes';
      win = window.open(href, title, winprops);
      if(win) { win.focus(); }
      return false;
    }

// =========================================================

// ======= image rollover =========
   function changeImage(this_image) {
    document.images.main_image.src=this_image;
   }