去掉按下去連結的虛線框

<a href="#" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image75','','img/about2/about-2_over_r12_c13.jpg',1)" hidefocus="true">

連結後面加上hidefocus="true"就可以去掉按下去連結的虛線框