<img src="http://photosku.com/images_file/small_images/s000_496.jpg" />img
{
opacity:1.0;
filter:alpha(opacity=100); /* IE8 及更早的版本 */
}
img:hover
{
opacity:0.5;
filter:alpha(opacity=50); /* IE8 以及更早的版本 */
}
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