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";
	}
      }