底部点击隐藏和弹出的效果

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>

<div id="btm">For a test!
    <input type="button" id="button" value="测试"> 
</div>

<div id="btm2">
    <input type="button" id="button2" value="测试"> 
</div>
<style type="text/css">
    #btm{
        width:200px;
        height:20px;
        background-color:darkred;
        color:yellow;
        position:fixed;
        right:50%;
        bottom:0;
    }
    #btm2{
        width:200px;
        height:20px;
        background-color:green;
        color:yellow;
        position:fixed;
        right:50%;
        bottom:-50px;
    }
</style>

</body>
</html>



<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
 $(document).ready(function(){
    BottomUp("#button","#button2","#btm","#btm2","-20px")        
 });
        
//底部弹出,隐藏
//btn1,btn2   点击 出现动画
//div1,div2   动画的div
//hgt   动画的幅度
function BottomUp(btn1,btn2,div1,div2,hgt){
     $(btn1).click(function(){
                   $(div1).animate({
                        bottom: hgt
                    },     
                    "slow",
                    function(){
                        $(div2).animate({bottom: '0px'}, "slow");
                    }
                    
                    );
                           
           })
           $(btn2).click(function(){                   
                $(div2).animate({bottom: hgt}, "slow",
                    function(){
                        $(div1).animate({bottom: '0px'}, "slow");
                    }
                );           
           })
}
</script>
扒了别人的一个底部弹出隐藏的广告, 乱七八糟的代码太多了, 并且与自己的css代码都冲突, 无奈试着写了下, 感觉还挺简单