如下css3代码如何变成3张以上的图片轮转？

Question

@-webkit-keyframes fadeInOut {0% {opacity:1;}25% {opacity:0;}50% {opacity: 0; }75% {opacity:1;}}.anim_fade_image {position:absolute; -webkit-animation-name: fadeInOut;-webkit-animation-timing-function: ease-in-out;-webkit-animation-iteration-count: infinite;-webkit-animation-duration: 12s;-webkit-animation-direction: alternate;}