css的img移上去边框效果及CSS透明度

css的img移上去边框效果：

.v_comment img{
height:36px;
height:36px;
float:left;
padding:1px;
margin:2px;
border: 1px solid #ddd;
}
.v_comment img:hover{border: 1px solid #ccc;
-webkit-animation: comm 1.1s ease-in infinite;
box-shadow:0 0 2px rgba(0,158,224,0.9);
-moz-box-shadow:0 0 2px rgba(0,158,224,0.9);
-webkit-box-shadow:0 0 2px rgba(0,158,224,0.9);
}

CSS透明度:

filter: alpha(opacity=50); -moz-opacity: 0.5; -khtml-opacity: 0.5; opacity: 0.5;