CSS实现的透明效果

/* 值越大，越不透明*/

img {     opacity: .75; /* Standard: FF gt 1.5, Opera, Safari */     filter: alpha(opacity=75); /* IE lt 8 */     -ms-filter: "alpha(opacity=75)"; /* IE 8 */     -khtml-opacity: .75; /* Safari 1.x */     -moz-opacity: .75; /* FF lt 1.5, Netscape */ }