function show_hide(id_num)
{
   news_id = 'news_'+id_num;
   fimg_id = 'fimg_'+id_num;

   if(Math.round(id_num / 2) != id_num / 2)
   {
      img_fname =  'http://{domain}modules/template/templates/img/cat_01_alt.gif';
      img_fname_open = 'http://{domain}modules/template/templates/img/cat_01_alt_open.gif';
   }
   else
   {
      img_fname =  'http://{domain}modules/template/templates/img/cat_01.gif';
      img_fname_open = 'http://{domain}modules/template/templates/img/cat_01_open.gif';
   }

   ctrl = document.getElementById(news_id);
   fimg = document.getElementById(fimg_id);

   if(ctrl.style.display =='none')
   {
      ctrl.style.display = "";
      fimg.src = img_fname_open;
   }
   else
   {
      ctrl.style.display = "none";
      fimg.src = img_fname;
   }
}