/**
 * prototype.js が必要です。
 */
var KenkyuList = {};

KenkyuList.order = false;

KenkyuList.updateContainer = 'kenkyulist';

KenkyuList.uri = 'kenkyu_list_sorter.php';

KenkyuList.sort = function(sortkey) {
  var ordername = KenkyuList.order ? "desc" : "asc";
  new Ajax.Updater(
    KenkyuList.updateContainer,
    KenkyuList.uri,
    {
      method: 'get',
      parameters: 'sortkey=' + sortkey + '&order=' + ordername,
      requestHeaders: ['If-Modified-Since','Wed, 15 Nov 1995 00:00:00 GMT']
    }
  );
  KenkyuList.order = !KenkyuList.order;
};