Problem to Captcha

Hi,
Here are the codes

    <title>test</title>
    <link rel="stylesheet" type="text/css" href="StyleSheet1.css"/>
    <link rel="stylesheet" type="text/css" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
    <script type="text/javascript" src="https://code.jquery.com/jquery-1.9.1.js"></script>
    <script type="text/javascript" src="http://sneakybrian.github.io/javascripts/CAPTCHA.js" ></script>
    <script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>
    <script type="text/javascript" src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
	...
    <div id="captcha"></div>
	...

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Here is the part in Javascript1.js

$(function () {

    var captcha = new CAPTCHA({
        selector: '#captcha',
        width: 400,
        height: 200,
        onSuccess: function () { alert('Correctly checked!'); }
    });

    captcha.generate();

});

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I mean I do not know why I cannot see Refresh button on page, to CAPTCHA.