function init () {
        var tables = document.getElementsByTagName("table");
        for (var i = 0; i < tables.length; i++) {
          if (tables[i].className.match(/zebra/)) {
            zebra(tables[i]);
          }
        }
      }

      function zebra (table) {
        var current = "oddRow";
        var trs = table.getElementsByTagName("tr");
        for (var i = 0; i < trs.length; i++) {
          trs[i].className += " " + current;
          current = current == "evenRow" ? "oddRow" : "evenRow";
        }
      }