前端自动滚动公告实现代码

<!--显示滚动条公告 qy -->

<div style="height:43px; width:608px; float:right; margin-top:10px;" onmouseover="chc('t7')" onmouseout="chc('t6')" id="t7">
    <div style="width:600px; height:43px; float:right; margin-left:15px; overflow:hidden" id=link_logoa>
    <c:forEach items="${amMessageTopShow}" var="amAnnouncesVar">
    <li style="width:600px; height:43px; overflow:hidden; margin-top:2px; float:right">
<div style="width:600px; height:43px; float:right;">
<table width="100%">
<tr style="font-weight:bold ">
    <!--  <td width = "25%"style="color:red"><spms:label key="system.update.amannounce"></spms:label></td>-->
<td><center><a href="editAmAnnounce.html?strAction=browserAmAnnounce&aaNo=${amAnnouncesVar.aaNo}&editFlag=2" target="_blank" title="${amAnnouncesVar.subject}">${amAnnouncesVar.subject}</a></center></td>
</tr>
</table>
</div>
</li>
</c:forEach>
 </div>
<script>  
var Mar = document.getElementById("link_logoa");  
var child_div=Mar.getElementsByTagName("li")  
var picH = 43;//移动高度  
var scrollstep=3;//移动步幅,越大越快  
var scrolltime=10;//移动频度(毫秒)越大越慢  
var stoptime=2000;//间断时间(毫秒)  
var tmpH = 43;  
Mar.innerHTML += Mar.innerHTML;  
function start(){  
if(tmpH < picH){  
tmpH += scrollstep;  
if(tmpH > picH )tmpH = picH ;