图片的滚动效果(上下滚动)

                 <div id="jsweb8_cn_bottom" style="overflow:hidden;height:150px;width:215px;">
<div id="jsweb8_cn_bottom1">
<asp:DataList ID="DLKHInfo" runat="server">
                        <ItemTemplate>
                        <table width="210" border="0" align="center" cellpadding="0" cellspacing="0">
                      <tr>
                        <td height="30" align="left" class="STYLE2"><a href="NewsDetail.aspx?id=<%#Eval("ID") %>">·<%#Server.HtmlDecode(DataBinder.Eval(Container.DataItem, "Title").ToString().
                                                                               Length > 12 ? DataBinder.Eval(Container.DataItem, "Title").ToString().Substring(0, 12) :
DataBinder.Eval(Container.DataItem, "Title").ToString()).ToString()%></a></td>
                      </tr>

                    </table>
                        </ItemTemplate>
                        </asp:DataList>
</div>
<div id="jsweb8_cn_bottom2"></div>
</div>
<script>
var speed=30
jsweb8_cn_bottom2.innerHTML=jsweb8_cn_bottom1.innerHTML
jsweb8_cn_bottom.scrollTop=jsweb8_cn_bottom.scrollHeight
function Marquee2(){
if(jsweb8_cn_bottom1.offsetTop-jsweb8_cn_bottom.scrollTop>=0)
jsweb8_cn_bottom.scrollTop+=jsweb8_cn_bottom2.offsetHeight
else{
jsweb8_cn_bottom.scrollTop--
}
}
var MyMar2=setInterval(Marquee2,speed)
jsweb8_cn_bottom.onmouseover=function() {clearInterval(MyMar2)}
jsweb8_cn_bottom.onmouseout=function() {MyMar2=setInterval(Marquee2,speed)}
</script>