function disabledFormsByName(el_name){ var el= eval(el_name); el.disabled = true;}
function enabledFormsByName(el_name){ var el= eval(el_name); el.disabled = false;}
function nullValue(el_name){ var el = eval(el_name); for (var c = (el.options.length-1); c >=0 ; c--) {el.options[c] = null;}}
function addBookmark(url, title){ if (!url) url = location.href;
  if (!title) title = document.title;
  if ((typeof window.sidebar == "object") && (typeof window.sidebar.addPanel == "function")) window.sidebar.addPanel (title, url, "");
  else if (typeof window.external == "object") window.external.AddFavorite(url, title);
  else if (window.opera && document.createElement){
    var a = document.createElement('A');
    if (!a) return false; //IF Opera 6
    a.setAttribute('rel','sidebar');
    a.setAttribute('href',url);
    a.setAttribute('title',title);
    a.click();
  }
  else return false;
  return true;}