function chgImg(id,isUp) {
   var img = "url(includes/templates/classic/images/Up_arrow.gif)";
   var el = document.getElementById(id).parentNode.id;
   var element = document.getElementById(el).childNodes;
   var i=0;var el2='';
   for (i;i<element.length;i++) {
      el2=element[i];
      if (el2.nodeName=="H3") {
         el2.style.backgroundImage = img;
         if (isUp) {
            el2.style.backgroundImage = "";
         }
      }
   }
}