Значение z-index

        .login-enter{
            display: block;
            background: url(../images/enter-fon.png) 0 0 repeat-x;
            height: 25px;
            width: 112px;
            position: absolute;
            top: 30px;
            left: 703px;
            font: bold 12px Arial;
            color: #000;
            line-height: 25px;
            text-align: center;
            cursor: pointer;
            z-index: 9999;
        }
            .login-enter:hover{
                background: url(../images/enter-fon.png) z-index: 9999; 0 bottom repeat-x;
                color: #fff;
            }

                .slider-item-small {
                    float: left;
                    width: 180px;
                    height: 119px;
                    position: relative;
                    float: left;
                    background: url(../images/slider-item-small.png) left bottom no-repeat;
                    margin: 335px 0 0 17px;
                    z-index: 9000;
                }
                
                .active-slider .slider-item-small, .slider-item-hover {
                    background: url(../images/slider-item-small.png) left top no-repeat !important;
                }
                
                    .slider-item-small-image {
                        width: 168px;
                        height: 88px;
                        position: absolute;
                        left: 5px;
                        top: 5px;
                        overflow: hidden;
                        cursor: pointer;
                    }
                    
                        .slider-item-small-image img {
                            border: 0;
                            width: 168px;
                            min-height: 88px;
                        }