.slider-wrap { position: relative; width: 980px; }
.slider-wrap img { position:absolute; }
.others-cover,
.left-cover,
.right-cover,
.center-cover { position: absolute; overflow:hidden; width: 980px; height: 443px; background: white;  }

.others-cover { display: none; left: 0; z-index: 1;  }
.left-cover { display: none; left: -610px; z-index: 3; width:610px; }
.right-cover { display: none; left: 980px; z-index: 3; width:610px;  }
.center-cover { left: 0px; z-index: 5;  }

.slider-wrap .item { position: absolute; }