火狐和IE中在area中添加onFocus="this.blur();不生效：报错

在area中如何去掉热点鼠标点击时出现的边框，解决兼容火狐、IE浏览器，onFocus="this.blur();只解决了chrome浏览器不显示边框，但在火狐、IE下仍出现虚线边框的情况。试过在<area>中添加hidefocus="true"无效

<table>   <tr>    <td><img name="Dec_jhs_r5_c1" src="images/r5_c1.jpg" width="700" height="533" border="0" id="r5_c1" usemap="#r5_c1" alt="" /></td>    <td><img src="images/spacer.gif" width="1" height="533" border="0" alt="" /></td>   </tr> </table> <map name="r5_c1" id="r5_c1"> <area  shape="poly" coords="1,0,700,0,701,142,555,142,490,250,315,249,317,301,0,301,1,0" href="#" target="_blank" alt="" onFocus="this.blur();" /> <area shape="poly" coords="1,301,302,309,306,533,2,531,1,301" href="#" target="_blank" alt="" onFocus="this.blur();"/> </map>