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$(function () {
var ie6 = document.all;
var dv = $('#fixedMenu_keleyi_com'), st;
dv.attr('otop', dv.offset().top); //存儲原來的距離頂部的距離
$(window).scroll(function () {
st = Math.max(document.body.scrollTop || document.documentElement.scrollTop);
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if (ie6) {//IE6不支持fixed屬性，所以只能靠設置position為absolute和top實現此效果
dv.css({ position: 'absolute', top: st });
}
else if (dv.css('position') != 'fixed') dv.css({ 'position': 'fixed', top: 0 });
} else if (dv.css('position') != 'static') dv.css({ 'position': 'static' });
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