jQuery实现底部浮动窗口效果

<script type="text/javascript" src="jquery-1.10.1.min.js"></script><style type="text/css">#foot_tel { width:100%;height:43px; background:url(styles/js/swt/tel_bj_20131123.png) no-repeat center center;_top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight));z-index: 10000; position:fixed; _position:absolute; bottom:0px; left:0px;}#foot_telBox { margin:0px auto;width:1112px; z-index: 8999;height:43px; overflow:hidden;}#foot_telBox li {list-style:none;}#foot_telBox .tel_txt { border:0px; float:left; font-size:14px; line-height:22px; height:22px; color:#999999; background:none; margin:16px 10px 0 244px; width:160px;}#foot_telBox .tel_sub { border:0px; float:left; height:25px; color:#0C6796; background: url(styles/js/swt/tel_sub.png) no-repeat; width:92px;cursor:pointer;margin-top: 14px;}#qqzhenshi{float:left;margin-left: 35px;}#qqzhenshi a{display: block; width: 135px; height: 20px; margin: 15px 0px 0px 0px;}#foot_show { width:100%; height:140px; background: url(styles/js/swt/footAdd_bg.png);_top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight));z-index: 20; position:fixed; _position:absolute; bottom:-140px; left:0px;}.foot_showBox{width:1000px;height:79px;margin:10px auto 0px auto;}</style><div id="foot_swt">  <div id="foot_tel">    <div id="foot_telBox">        <li style="float:left;">          <input type="text" onclick="openOline();" value="在线问问医生" class="tel_txt" />          <input type="button" value="" onclick="openOline();" class="tel_sub" />        </li>        <li id="qqzhenshi"><a href="###" target="_blank"></a></li>        <li style="width: 422px; float: right;list-style: none;"><span style="float: left; padding-top: 14px; width:360px; text-align:left"><a style="display:block" href="###" target="_blank"><img src="styles/js/swt/anniu_20130627.gif"></a></span><span style="float:right;"><a href="#" target="_self"><img src="styles/js/swt/tel_s4.gif"></a></span></li>    </div>  </div>  <div id="foot_show">    <div class="foot_showBox"><img src="styles/js/swt/footAdd.png" alt="" border="0" usemap="#Mapfoot" />      <map name="Mapfoot" id="Mapfoot">        <area shape="rect" coords="640,10,891,288" href="###" target="_blank" />      </map>    </div>  </div></div><script type="text/javascript">$(function(){  $('#foot_swt').mouseover(function(){    $('#foot_show').stop().animate({'bottom':'0px'},'fast');  })  $('#foot_swt').mouseout(function(){    $('#foot_show').stop().animate({'bottom':'-140px'},'fast');  })});function openOline(){  window.open("###", "_blank");}</script>