基于jQuery遮罩图片hover翻转效果

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                        <img src="images/1413775760-7544.jpg" width="294" height="267">
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                        <img src="images/1411890878-8918.jpg" width="294" height="267">
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                    <span class="back-face to-top"></span>
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                    <span class="txt-hide front-face">
                        <img src="images/1413775714-2418.jpg" width="294" height="267">
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                    <span class="back-face to-top"></span>
                </a>
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                    <span class="txt-hide front-face">
                        <img src="images/1400684434-4609.jpg" width="294" height="267">
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                    <span class="back-face to-top"></span>
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                    <span class="txt-hide front-face">
                        <img src="images/1428032296-8158.jpg" width="294" height="267">
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                    <span class="back-face to-top"></span>
                </a>
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                <a href="http://www.w2bc.com/">
                    <span class="txt-hide front-face">
                        <img src="images/1405250374-3685.jpg" width="294" height="267">
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