A drop-down box with checkbox implemented by js csss_javascript skills

<style type="text/css"> 
/* 带复选框的下拉框 */ 
ul li{ 
list-style: none; 
padding:0px; 
margin: 0px; 
} 

.select_checkBox{ 
border:0px solid red; 
position: relative; 
display:inline-block; 


} 
.chartQuota{ 
height:23px; 
float:left; 
display:inline-block; 
border:0px solid black; 
position: relative; 
} 

.chartOptionsFlowTrend{ 
z-index:300; 
background-color:white; 
border:1px solid gray; 
display:none; 
position: absolute; 
left:0px; 
top:23px; 
width:150px; 
} 
.chartOptionsFlowTrend ul{ 
float:left; 
padding: 0px; 
margin: 5px; 
} 
.chartOptionsFlowTrend li{ 
/* float:left; */ 
display:block; 
position: relative; 
left:0px; 
margin: 0px; 
clear:both; 
} 
.chartOptionsFlowTrend li *{ 
float:left; 
} 
a:-webkit-any-link { 
color: -webkit-link; 
text-decoration: underline; 
cursor: auto; 
} 
.chartQuota p a { 
float: left; 
height: 21px; 
outline: 0 none; 
border: 1px solid #ccc; 
line-height: 22px; 
padding: 0 5px; 
overflow: hidden; 
background: #eaeaea; 
color: #313131; 
text-decoration: none; 
} 

.chartQuota p { 
margin:0px; 
folat:left; 
overflow: hidden; 
height: 23px; 
line-height:24px; 
display: inline-block; 
} 
.chartOptionsFlowTrend p { 
height: 23px; 
line-height: 23px; 
overflow: hidden; 
position: relative; 
z-index: 2; 
background: #fefbf7; 
padding-top: 0px; 
display: inline-block; 
} 
.chartOptionsFlowTrend p a { 
border: 1px solid #fff; 
margin-left: 15px; 
color: #2e91da; 
} 
</style>

<div class="select_checkBox"> 
<div class="chartQuota"> 
<p> 
<a href="javascript:;" hidefocus="true" title="请选择指标"><span>选择指标</span> 
<b></b> 
</a> 
</p> 

</div><br> 
<div class="chartOptionsFlowTrend""> 
<ul> 
<li class=""><input type="checkbox" value="1"><span>浏览次数（PV）</span> 
</li> 
<li class=""><input type="checkbox" value="1"><span>独立访客（UV）</span> 
</li> 
<li class=""><input type="checkbox" value="1"><span>IP</span> 
</li> 
<li class=""><input type="checkbox" value="1"><span>新独立访客</span> 
</li> 
<li class=""><input type="checkbox" value="1"><span>访问次数</span> 
</li> 
</ul> 
<p> 
<a href="javascript:;" title="确定" hidefocus="true" class="a_0">确定</a><a 
href="javascript:;" title="取消" hidefocus="true" class="a_1">取消</a> 
</p> 
</div> 
</div>

<script type="text/javascript"> 
$(function(){ 
$(".select_checkBox").hover(function(){ 
$(".chartOptionsFlowTrend").css("display","inline-block"); 
},function(){ 
$(".chartOptionsFlowTrend").css("display","none"); 
}); 
}); 
</script>