onmouseover 文字变化

 <tr >
      <td colspan="2"> &nbsp;<div id="carname"></div></td>
    </tr>
    <script>
      function swapGroupReviewClass(reviewId)
     {
      var title = document.getElementById('carname');
      title.innerHTML = reviewId;
     }
    </script>
    <tr >
      <td>&nbsp;<img src="../image/point.gif"></td><td><a href="" onMouseOver="leadcar.src='../image/lead/car.gif';swapGroupReviewClass('Gas Mileage Champs');">Gas Mileage Champs</a></td>
    </tr>
    <tr >
      <td>&nbsp;<img src="../image/point.gif"></td><td><a href="" onMouseOver="leadcar.src='../image/lead/car2.gif';swapGroupReviewClass('Compact Cars');">Compact Cars</a></td>
    </tr>