控制png背景透明

    <!--[if lte IE 7]>
        <script src="js/DD_belatedPNG_0.0.8a-min.js" type="text/javascript"></script>
            <script type="text/javascript">
                DD_belatedPNG.fix('div, ul, img, li, input , a');
            </script>
    <![endif]-->