我如何允许别人选择自己的年龄?加载步骤2或重定向

我在编辑登陆页时遇到了麻烦。我需要让来访者选择他们的年龄。24岁或以上，他们进入第二步，如果他们选择24岁以下，他们会被发送到http://www.google.com。如果他们没有选择一个答案，他们会弹出一个"选择一个答案"。

<form action="index.php" method="post">
    <div class="select-holder">
        <div class="select-wrap">
            <select name="age">
                <option value="Select Your Answer" selected="selected">Select Your Answer</option>
                <option value="1">I am 24+ years old. Let me in!</option>
                <option value="5">I am under 24 years old.</option>
            </select>
        </div>  
    </div>
    <input value="Continue" class="submit-button" type="submit">
</form>

在页面底部:

<!-- Move all javascripts to bottom for faster page loading -->
<script src="js/jquery-1.8.2.min.js" type="text/javascript"></script>
<script src="js/html5.js" type="text/javascript"></script>
<script src="js/functions.js" type="text/javascript"></script>
<script src="js/silentpopslim.js" type="text/javascript"></script>
<input type="hidden" id="hidLocation" value="{Your CPVLab Domain here}" />
<script type="text/javascript" src="/js/function.js"></script>      
<!--    // This will be populated from functions.js when the user selects the age so in the 
// second step, when it renders, it tracks the user's age.-->
<img id="cpvlab_pix" src="">
<img src="{Your URL to track direct visitors to the page}" />

这是function.js。我不确定所选择的选项触发了一定的结果(不是编程术语，但请与我在这里工作。

$(function() {  
    $(document).on('focusin', '.field, textarea', function() {
        if(this.title==this.value) {
            this.value = '';
        }
    }).on('focusout', '.field, textarea', function(){
        if(this.value=='') {
            this.value = this.title;
        }
    });
    $(document).on('click', '.submit-button', function(){
        if($('select').find('option:selected').index() == 0) {
            alert('Select Your Answer.')
            return false;
        }
        if($('select').find('option:selected').index() != 1) {
            window.location('http://www.google.com');
            return false;
        } else {
            // $('.header_wrapper').slideUp();
            $('.step-1').hide();
            // $('.step-2').fadeIn(200);
            $('.step-2').fadeIn(800);
            return false;
        }
    });
});

这是步骤2的HTML5.js，我想?

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