div动态消失的动画效果

http://www.w3school.com.cn/jquery/jquery_effects.asp

 //关闭大悬浮框的方法，弹出小开关框
    function closeBigPanel(){
        var bigDiv = $(".floatPanel_div");
        bigDiv.animate({'0px'},"fast");
        var smallDiv = $(".samll_floatPanel_div");
        smallDiv.animate({'100px'},"fast");
        $(".samll_floatPanel_div p").show();
    }
    //打开大悬浮框的方法，关闭小开关框
    function showBigPanel(){
        $(".samll_floatPanel_div p").hide();
        var smallDiv = $(".samll_floatPanel_div");
        smallDiv.animate({'0px'},"fast");
        var bigDiv = $(".floatPanel_div");
        bigDiv.animate({'100%'},"fast");
    }