各位大家：本人初接触网站开发，遇到个问题，图片滚动一段时间之后，就停下来，不滚动了，为什么？？该怎么修改啊？
<div align='center' id='demo' style='overflow:hidden;height:130px;width:966px;'>
<%
    set RsPic=server.createobject("adodb.recordset")
    sql="select top 6 * from Info where Ispic=1 and Pw_Good=True ORDER BY id DESC"
    RsPic.open sql,conn,1,1
    if RsPic.eof or RsPic.bof then
    Call NoPic("暂无图文新闻")
    end if
%>
<table border='0' align='center' cellpadding='0' cellspace='0'>
<tr>
    <td width="687" valign='top' id='demo1'>
        <table width='100%' cellpadding='0' cellspacing='0' border='0' align='center'>
        <tr valign='top'>
    <%
    do while not RsPic.eof 
        %>
            <td align='center'>
<%   Call zf11_NewsShowPic(RsPic("Pic"),RsPic(0),RsPic("Title"),110,90,18)%>            
            </td>
      <%
    RsPic.movenext
    loop
    RsPic.CLOSE
    SET RsPic=Nothing
    %>
        </tr>
        </table>
    </td>
    <td width="24" valign=top id=demo2></td>
</tr>
</table>

<script>
var speed=15
demo2.innerHTML=demo1.innerHTML
function Marquee1(){
if(demo2.offsetWidth-demo.scrollLeft<=0)
demo.scrollLeft-=demo1.offsetWidth
else{
demo.scrollLeft++
}
}
var MyMar1=setInterval(Marquee1,speed)
demo.onmouseover=function() {clearInterval(MyMar1)}
demo.onmouseout=function() {MyMar1=setInterval(Marquee1,speed)}
</script>
</div>



<%
    '//新闻图片调用
    Function zf11_NewsShowPic(zf11_NewsPic,zf11_NewsInfoID,zf11_NewsTitle,zf11_NewsWith,zf11_NewsHeight,zf11_Newslong)
    response.write "<table width='100%' border=0 cellspacing=0 cellpadding=0><tr><td>"
    response.write "<TABLE border=0 align=center cellPadding=0 cellSpacing=0>"
    response.write "<TR><TD height=8><IMG height=8 src='Images/table/bg_0ltop.gif' width=8></TD>"
    response.write "<TD background=Images/table/bg_01.gif height=8></TD>"
    response.write "<TD height=8><IMG height=8 src='Images/table/bg_0rtop.gif' width=8></TD></TR>"
    response.write "<TR><TD width=8 background=Images/table/bg_03.gif></TD>"
    response.write "<TD width=50 height=90 align=center bgColor=#ffffff><a href=typenews.asp?id="&zf11_NewsInfoID&" Title='"&zf11_NewsTitle&"'><img src="&zf11_NewsPic&" border=0 width="&zf11_NewsWith&" height="&zf11_NewsHeight&" ></a></TD>"
    response.write "<TD width=8 background=Images/table/bg_04.gif></TD>"
    response.write "</TR><TR><TD height=8><IMG height=8 src='Images/table/bg_0lbottom.gif' width=8></TD>"
    response.write "<TD background=Images/table/bg_02.gif height=8></TD>"
    response.write "<TD height=8><IMG height=8 src='Images/table/bg_0rbottom.gif' width=8></TD>"
    response.write "</TR></TABLE>"
    response.write "</td></tr><tr><td align=center height=18>"
    response.write "<a href=typenews.asp?id="&zf11_NewsInfoID&" title='"&zf11_NewsTitle&"'>"
    if GetLen(zf11_NewsTitle)>zf11_Newslong then
    response.write LeftStr(zf11_NewsTitle,zf11_Newslong-2)
    response.write "..."
    else
    response.write zf11_NewsTitle
    end if
    response.write "</a>"
    response.write "</td></tr></table>"
    End Function
%>