function table_rollover() {

      var rows = document.getElementsByTagName('tr');

      for (var i = 0; i < rows.length; i++) {

        rows[i].onmouseover = function() {
        this.className += ' hilite';
        }

        rows[i].onmouseout = function() {
        this.className = this.className.replace('hilite', '');
        }
      }
    }

    addLoadEvent(table_rollover);