function ajxstatechange(id) {
       if (http_request.readyState == 4) {
              if (http_request.status == 200) {
                   //alert(http_request.responseText);
                   document.getElementById(id).innerHTML=unescape(http_request.responseText);
              } else {
                   //document.write(http_request.responseText);
                   alert('URL error'+http_request.responseText);
              }
       }
}