function new_captcha_image() {
    if (captcha_image_url.indexOf('?') == -1) {
      document.getElementById('captcha_image').src= captcha_image_url+'?c='+captcha_reload_count;
    }
    else {
      document.getElementById('captcha_image').src= captcha_image_url+'&c='+captcha_reload_count;
    }

    document.getElementById('captcha_input').value="";
    document.getElementById('captcha_input').focus();
    captcha_reload_count++;
  }

  function opendetailwindow() {
    window.open('','detailwindow','toolbar=no,scrollbars=yes,resizable=no,width=680,height=480');
  }

  function popup(mylink, windowname) {
    if (! window.focus) return true;
      var href;
    if (typeof(mylink) == 'string')
      href=mylink;
    else
      href=mylink.href;
    window.open(href, windowname, 'width=500,height=300,scrollbars=no');
    return false;
  }