圖片移入灰階 移出彩色

.picOver {
    filter:alpha(opacity=100) Gray; opacity:0.5; moz-opacity:0.5;
}
.picOut {
    filter:;
}

<img src="cms/<?php echo $row_RecNews['news_s_photo1']; ?>" border="0" onmouseover="this.className='picOver'" onmouseout="this.className='picOut'" />