SOURCE

$(function() {
    $('#toright').hover(function() {
        $("#toleft").hide()
    }, function() {
        $("#toleft").show()
    })
    $('#toleft').hover(function() {
        $("#toright").hide()
    }, function() {
        $("#toright").show()
    })
})

var t;
var index = 0;
t = setInterval(play, 3000)

function play() {
    index++;
    if (index > 4) {
        index = 0
    }
    $("#lunbobox ul li").eq(index).css({
        "background": "#999",
        "border": "1px solid #ffffff"
    }).siblings().css({
        "background": "#cccccc",
        "border": ""
    })

    $(".lunbo a ").eq(index).fadeIn(1000).siblings().fadeOut(1000);
};

$("#lunbobox ul li").click(function() {

    $(this).css({
        "background": "#999",
        "border": "1px solid #ffffff"
    }).siblings().css({
        "background": "#cccccc"
    })
    var index = $(this).index(); 

    $(".lunbo a ").eq(index).fadeIn(1000).siblings().fadeOut(1000); 
});

$("#toleft").click(function() {
    index--;
    if (index <= 0) 
    {
        index = 4
    }
    console.log(index);
    $("#lunbobox ul li").eq(index).css({
        "background": "#999",
        "border": "1px solid #ffffff"
    }).siblings().css({
        "background": "#cccccc"
    })

    $(".lunbo a ").eq(index).fadeIn(1000).siblings().fadeOut(1000); 
}); 

$("#toright").click(function() {
    index++;
    if (index > 4) {
        index = 0
    }
    console.log(index);
    $(this).css({
        "opacity": "0.5"
    })
    $("#lunbobox ul li").eq(index).css({
        "background": "#999",
        "border": "1px solid #ffffff"
    }).siblings().css({
        "background": "#cccccc"
    })
    $(".lunbo a ").eq(index).fadeIn(1000).siblings().fadeOut(1000); 
});

$("#toleft,#toright").hover(function() {
        $(this).css({
            "color": "black"
        })
    },
    function() {
        $(this).css({
            "opacity": "0.3",
            "color": ""
        })
    })

$("#lunbobox ul li,.lunbo a img,#toright,#toleft ").hover(
    function() {
        $('#toright,#toleft').show()
        clearInterval(t);

    },
    function() {
        t = setInterval(play, 3000)

        function play() {
            index++;
            if (index > 4) {
                index = 0
            }
            $("#lunbobox ul li").eq(index).css({
                "background": "#999",
                "border": "1px solid #ffffff"
            }).siblings().css({
                "background": "#cccccc"
            })
            $(".lunbo a ").eq(index).fadeIn(1000).siblings().fadeOut(1000);
        }
    })

<div class="middle_right">
	<div id="lunbobox">
		<div id="toleft">
			&lt;</div>
		<div class="lunbo">
			<a href="#"><img src="http://114.116.34.206/img/1.jpg"></a>
                    <a href="#"><img src="http://114.116.34.206/img/2.jpg"></a>
                    <a href="#"><img src="http://114.116.34.206/img/3.jpg"></a>
                    <a href="#"><img src="http://114.116.34.206/img/4.jpg"></a>
                    <a href="#"><img src="http://114.116.34.206/img/5.jpg"></a>
                </div>
                <div id="toright">&gt;</div>
                <ul>
                    <li>1</li>
                    <li>2</li>
                    <li>3</li>
                    <li>4</li>
                    <li>5</li>
                </ul>
                <span></span>
        </div>
    </div>

#lunbobox {
	width:500px;
	height:300px;
	position:relative;
}
.lunbo {
	width:500px;
	height:300px;
}
.lunbo img {
	width:500px;
	height:300px;
	position:absolute;
	top:0px;
	left:0px;
}
#lunbobox ul {
	width:285px;
	position:absolute;
	bottom:10px;
	right:0px;
	z-index:5;
}
#lunbobox ul li {
	cursor:pointer;
	width:10px;
	height:4px;
	border:1px solid #cccccc;
	float:left;
	list-style:none;
	background:#cccccc;
	text-align:center;
	margin:0px 5px 0px 0px;
}
#toleft {
	display:none;
	width:30px;
	height:100px;
	font-size:40px;
	line-height:100px;
	text-align:center;
	color:#f4f4f4;
    position:absolute;
	top:90px;
	left:12px;
	cursor:pointer;
	z-index:99;
	opacity:0.4;
}
#toright {
	display:none;
	width:30px;
	height:100px;
	font-size:40px;
	line-height:100px;
	text-align:center;
	color:#f4f4f4;
    position:absolute;
	top:90px;
	right:0px;
	cursor:pointer;
	z-index:99;
	opacity:0.4;
}