Slide Show em Jquery HTML5 CSS3

*{
    margin: 0;
    padding: 0;
    border: 0;
}

html{
    background: #f9f9f9;
}

#slider{
    position: relative;
    overflow: hidden;
    margin: 20px auto 0 auto;
    border-radius: 4px;
}

#slider ul{
    list-style: none;
    position: relative;
    height: 200px;
}

#slider ul li{
    position: relative;
    display: block;
    float: left;
    width: 400px;
    height: 400px;
    background: #ccc;
    text-align: center;
    line-height: 300px;
}

a.control_next, a.control_prev{
    position: absolute;
    top: 50%;
    z-index: 999;
    display: block;
    padding: 4px;
    background: blue;
    color: black;
    text-decoration: none;
    font-weight: bold;
    font-size: 50px;
    cursor: pointer;
    border-radius: 10px;
}

a.control_prev:hover, a.control_next:hover{
    opacity: 1;
    color: #00ff15;
    background: red;
}

/*Para o controlador nao sumir*/
a.control_next{
    right: 0;
}