为什么onmouseover报错

<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .banner{
            width: 650px;
            height: 130px;
            position: relative;
        }
        .btn{
            position: absolute;
            bottom: 10px;
            right: 10px;
        }
        .btn span{
            display: inline-block;
            color: red;
            width: 20px;
            text-align: center;
            margin-right: 5px;
            border: #FFF solid 2px;
        }

    </style>
    <script type="text/javascript">
        window.onload = function(){
            var arr = new Array;
            arr[0] = "http://pic2.ooopic.com/10/93/86/00b1OOOPIC79.jpg";
            arr[1] = "http://pic2.ooopic.com/10/59/05/79b1OOOPICde.jpg";
            arr[2] = "http://pic2.ooopic.com/10/58/57/39b1OOOPIC96.jpg";

            
            var cont = 0;
            function palys(){
                if (arr.length == cont)
                    cont = 0;
                    document.getElementById("banner").src = arr[cont];
                    cont++;
                
            }

            var times = setInterval(palys,2000);

            function cleartimes(){
                clearInterval(times);
            }

            function show(num){
                cleartimes();
                var index = parseInt(num);
                document.getElementById("banner").src = arr[index - 1];
                cont = index;
            }
            
        }
    </script>
</head>
<body>
    <div>
        <img src="http://pic2.ooopic.com/10/93/86/00b1OOOPIC79.jpg" width="650;" height="130" id="banner" />
        <div>
            <span onmouseover="show(1)">1</span>
            <span onmouseover="show(2)">2</span>
            <span onmouseover="show(3)">3</span>
        </div>
    </div>
</body>
</html>
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为什么onmouseover报错

2回答
