鼠标点击隐藏层出现

<style>
*{ font-size:12px; margin:0; padding:0;}
ul, li {list-style: none outside none;}
.clear{line-height:0px;height:0px;clear:both;font-size:0px;overflow:hidden;}
.lchfrr-box{ width:236px; height:50px; background:#f1f1f1; padding:10px 10px 0; margin:0 auto;}
.lchfrr-box dl{ float:left; display:inline; overflow:hidden;}
.lchfrr-box dl dt{width:60px;height:40px; line-height:40px; font-size:12px;font-weight:bold; color:#999; text-align:right; background:#FF9;float:left}
.lchfrr-box dl dd{width:168px;height:30px;padding-left:8px; padding-top:8px; background:#3FF;float:left}
.lchfrbox-labe{ width:150px; height:25px; line-height:25px; border:1px solid #ccc;padding-left:6px;float:left;}
.lchfrbox-svhid{float:left; display:none}
.lchfrbox-svhid .rbox{ position:absolute; z-index:34;left:50%; margin-left:-50px;margin-top:24px;}
.lchfrbox-svhid .rbox .rboxiframe{width:148px; height:120px;background:#fff;z-index:-1}
.lchfrbox-svhid .rbox .rtb{ width:148px; height:auto;border:1px solid #ccc; background:#FFF;-webkit-box-shadow: 3px 3px 10px #ccc;box-shadow: 3px 3px 10px #ccc;position:absolute; z-index:35;top: 0;left: 0;}
.lchfrbox-svhid .rbox .rtb a{width:143px; height:25px; line-height:25px; color:#333; text-decoration:none; padding-left:5px;float:left; overflow:hidden}
.lchfrbox-svhid .rbox .rtb a:hover{ color:#fff; background:#3399ff;}
</style>
<div class="lchfrr-box">
    <dl>
        <dt>理财期限</dt>
        <dd>
            <div class="lchfrbox-labe" onmousedown="document.getElementById('homeissl1').style.display='block';">不限</div>
            <!--隐藏层 s-->
            <div class="lchfrbox-svhid" id="homeissl1" >
                <div class="rbox">
                    <iframe class="rboxiframe" frameborder="0"></iframe>
                    <div class="rtb" onmouseenter="document.getElementById('homeissl1').style.display='block';" onmouseleave="document.getElementById('homeissl1').style.display='none';">
                        <a href="#">1个月内</a>
                        <a href="#">1-3个月</a>
                        <a href="#">3-6个月</a>
                        <a href="#">6-12个月</a>                     
                        <a href="#">1年以上</a>
                        <div class="clear"></div>
                    </div>                                    
                </div>                          
            </div>
        </dd>
    </dl>
</div>