/* background-highlighting for author affiliations */
function highlight_affiliation(id, mode) {
      if (document.getElementById) var aff = document.getElementById(id);
      else if (document.all)  var aff = document.all[id];
      else if (document.layers)  var aff = document.layers[id];
 if (mode == 'on')
   aff.className = 'aff-highlight';
 else if (mode == 'off')
   aff.className = '';
}