<style type="text/css">
*{ margin:0px auto; padding:0px}
#xiala{ 200px; height:40px; border:1px solid #999;text-align:center; line-height:40px; vertical-align:middle;}
#xiala:hover{ cursor:pointer}
.list{ 200px; height:40px; text-align:center; line-height:40px; vertical-align:middle; border:1px solid #999; border-top-0px; display:none}
.list:hover{ cursor:pointer; background-color:#63C; color:white;}
</style>
</head>
<body>
<br />
<div style="500px; height:500px;">
<div id="xiala" onclick="showa()"></div>
<div class="list" onclick="xuan(this)">山东</div>
<div class="list" onclick="xuan(this)">北京</div>
<div class="list" onclick="xuan(this)">上海</div>
<div class="list" onclick="xuan(this)">深圳</div>
<div class="list" onclick="xuan(this)">广州</div>
</div>
<script type="text/javascript">
function showa()
{
var list = document.getElementsByClassName("list");
for(var i=0; i<list.length;i++)
{
list[i].style.display = "block";
}
}
function xuan(a)
{
var nr = a.innerHTML;
document.getElementById("xiala").innerHTML=nr;
var list = document.getElementsByClassName("list");
for(var i=0; i<list.length;i++)
{
list[i].style.display = "none";
}
}
</script>