function flashChecker() {
    var hasFlash = 0;　　　　 //是否安装了flash
    var flashVersion = 0;　　 //flash版本
    if (document.all) {
        var swf = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
        if (swf) {
            hasFlash = 1;
            VSwf = swf.GetVariable("$version");
            flashVersion = parseInt(VSwf.split(" ")[1].split(",")[0]);
        }
    } else {
        if (navigator.plugins && navigator.plugins.length > 0) {
            var swf = navigator.plugins["Shockwave Flash"];
            if (swf) {
                hasFlash = 1;
                var words = swf.description.split(" ");
                for (var i = 0; i < words.length; ++i) {
                    if (isNaN(parseInt(words[i]))) continue;
                    flashVersion = parseInt(words[i]);
                }
            }
        }
    }
    return {
        f: hasFlash,
        v: flashVersion
    };
}
 
$(function(){
    $('.yd-close').click(function(){
         $(this).parent().remove();
    });

    var top = $('.header'),
        nav = $('.d-navs'),
        ml = $('.m-l'),
        piao = $('.piao'),
        nav_h = nav.outerHeight(),
        piao_top = nav_h + 20,
        piao_h = piao.outerHeight(),
        top_h = top.outerHeight() + nav_h - 20,
        ml_top = ml.offset().top;
    $(window).scroll(function(){
        var s_top = $(document).scrollTop(),
            ml_h = ml.outerHeight();
            nav_fixed = 'fixed' == nav.css('position');
        if (s_top > top_h) {
            if (!nav_fixed) {
                nav.css({position:'fixed',top:'-'+nav_h+'px'}).animate({top:'0'},100);
                top.css({marginBottom:nav_h+'px'});
            }
            if (piao_h < ml_h) {
                if (ml_top + ml_h - s_top - piao_h >= piao_top) {
                    piao.css({position:'fixed',top:piao_top+'px',marginTop:0});
                } else {
                    piao.css({position:'static',marginTop:(ml_h - piao_h)+'px'});
                }
            }
        } else {
            if (nav_fixed) {
                nav.removeAttr('style');
                top.removeAttr('style');
            }
            if ('fixed' == piao.css('position') || '0px' != piao.css('marginTop')) {
                piao.removeAttr('style');
            }
        }
    });
});