// check search: enabled/disabled AUTHOR input
function check_search() {
  sfa = document.search_form.search_area;
  len = sfa.length;
  for (i=0; i<len; i++) {
    if (sfa.options[i].selected) {
      if (sfa.options[i].value=="3") {
        document.search_form.author.style.display = "inline";
      }
      else {
        document.search_form.author.value = "";
        document.search_form.author.style.display = "none";
      }
    }
  }
}