HTML+CSS布局(常用css控制属性)小结

<div id="contner">
<div id="header"><h1>header部分</h1>
</div>
<div id="mian">
<div id="leftnav">
<div id="nav">
<h3>物理层</h3>
<div>
<a href="http://.baidu." target="ife">呵呵</a>
<a href="#">222</a>
<a href="#">333</a> </div>
<h3>数据链路</h3>
<div>
<a href="#">aaa</a>
<a href="#">bbb</a>
<a href="#">c</a>
</div>
<h3>网络层</h3>
<div>
<a href="#">aaa</a>
<a href="#">bbb</a>
<a href="#">c</a>
</div>
<h3>传输层</h3>
<div>
<a href="#">aaa</a>
<a href="#">bbb</a>
<a href="#">c</a>
</div>
<h3>表示层</h3>
<div>
<a href="#">aaa</a>
<a href="#">bbb</a>
<a href="#">c</a>
</div>
<h3>应用层</h3>
<div>
<a href="#">aaa</a>
<a href="#">bbb</a>
<a href="#">c</a>
</div>
</div>
</div><!--这部分是左侧导航-->
<div id="rightif">
<div align="center">
<iframe width="100%" height="100%" id="ife"></iframe>
</div>
</div>
<div id="footer"></div>
</div>

body{ margin:0px;text-align:center;}
#contner{ width:996px; margin:0px auto;}
#header{ height:150px; background-color:#999999;}
#leftnav{ background-color:#999966; float:left; width:20%;}
#rightif{ background-color:#FF9933; float:left; width:80%; border:0px;}
{margin:0; padding:0}
#nav{ width:150px; margin:0px auto; text-align:left;}
#nav h3{ cursor:pointer; line-height:30px; height:30px;}
#nav a{display:block; line-height:24px;color:#666666; margin-left:20px;}
#nav a:hover{background-color:#eee; color:#000;}
#nav div{display:none; border-:none}

script type="text/javascript">
function $(id){return document.getElementById(id)}
window.onload = function(){
$("nav").onclick = function(e){
var src = e?e.target:event.srcElement;
if(src.tagName == "H3"){
var next = src.nextElementSibling || src.nextSibling;
next.style.display = (next.style.display =="block")?"none":"block";
}
}
}
</script>

<ul>
<li>蓝莲花</li>
<li>老男孩</li>
<li>父亲</li>
<li>希望</li>
</ul>
ul{ list-style-type:none; float:left; margin:0px; padding:0px;}
ul li{ list-style-type:none; float:left; width:99px; display:block; line-height:30px; text-align:center;}