左右动态布局
布局{右边框架浮动（动态显示）/左边框浮动（动态显示）}
右边框代码部分：
<style type="text/css">
#header,#content,#footer{
background-color:#ccc;
border:1px solid #0c0;
height:30px;
width:80%;
margin:10px auto;
}
#content{
height:500px;
}
#left{
height:500px;
width:100px;
border:1px red solid;
float:left;
background-color:#966;
}
#right{
height:500px;
border:1px green solid;
background-color:#c96;
}
</style>
左边框代码部分：
<style type="text/css">
#header,#content,#footer{
background-color:#ccc;
border:1px solid #0c0;
height:30px;
width:80%;
margin:10px auto;
}
#content{
height:500px;
}
#left{
height:500px;
width:68%;
border:1px red solid;
float:left;
background-color:#966;
}
#right{
height:500px;
width:100px;
border:1px green solid;
background-color:#c96;
float:right;
}
</style>
html代码不变
<body>
<div id="header"></div>
<div id="content">
<div id="left"></div>
<div id="right">
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</div>
</div>
<div id="footer"></div>
</body>
</html>
