js代码
<SCRIPT language="JavaScript">
    <!-- Begin
    var xPos = 20;
    var yPos = 0;
    var step = 1;
    var delay = 30;
    var height = 0;
    var Hoffset = 0;
    var Woffset = 0;
    var yon = 0;
    var xon = 0;
    var pause = true;
    var interval;
    
    floatDiv.style.top = yPos;
    
    function changePos()
    {
     width = document.body.clientWidth;
     height = document.body.clientHeight;
     Hoffset = floatDiv.offsetHeight;
     Woffset = floatDiv.offsetWidth;
     floatDiv.style.left = xPos + document.body.scrollLeft;
     floatDiv.style.top = yPos + document.body.scrollTop;
     if (yon)
     {
      yPos = yPos + step;
     }
     else
     {
      yPos = yPos - step;
     }
     
     if (yPos < 0)
     {
      yon = 1;
      yPos = 0;
     }
     
     if (yPos >= (height - Hoffset))
     {
      yon = 0;
      yPos = (height - Hoffset);
     }
     
     if (xon)
     {
      xPos = xPos + step;
     }
     else
     {
      xPos = xPos - step;
     }
     
     if (xPos < 0)
     {
      xon = 1;
      xPos = 0;
     }
     
     if (xPos >= (width - Woffset))
     {
      xon = 0;
      xPos = (width - Woffset);
     }
    }
    
    function start()
    {
     floatDiv.visibility = "visible";
     interval = setInterval('changePos()', delay);
    }
    
    function stops()
    {
     clearInterval(interval);
    }
    
    start();
    //  End -->
   </SCRIPT>

body代码：

<div class="table" id="floatDiv" onMouseOut="start();" onMouseOver="stops();" style="Z-INDEX: 1;LEFT: 0px;BACKGROUND-IMAGE: url(images/default/bobybg.gif);WIDTH: 180px;POSITION: absolute;TOP: 0px;HEIGHT: 60px"
    runat="server">
    <table id="Table1" cellSpacing="7" cellPadding="0" width="100%" border="0" runat="server">
     <tr>
      <td style="WORD-BREAK: break-all"><asp:DataList id="rptBulletinFloat" Runat="server">
        <ItemTemplate>
         <TABLE width="98%" align="center" border="0" cellPadding="3" cellSpacing="0">
          <tr>
           <td valign="top" width="10">
            <img src="images/Default/bulletin_icon.gif" align="absMiddle" height="12" width="10">
           </td>
           <td align="left">
            <a style="COLOR:#8E236B" target="_blank" href='InformationRelease/Information/InformationView.aspx?informationId=<%# DataBinder.Eval(Container, "DataItem.Id") %>' onclick="OpenFullWindow(this.href);return false;">
             <%# Convert.ToString(DataBinder.Eval(Container.DataItem, "title")).Length> 20 ? Convert.ToString(DataBinder.Eval(Container.DataItem,"title")).Substring(0, 20)+"..." : DataBinder.Eval(Container.DataItem, "title")%>
             ; </a>
           </td>
          </tr>
         </TABLE>
        </ItemTemplate>
       </asp:DataList></td>
     </tr>
     <tr>
      <td align="right"><a onclick="funClose();" style="CURSOR:hand;color:blue">关闭</a> <input id="txtIsNull" style="DISPLAY: none" type="text" name="txtIsNull" runat="server">
      </td>
     </tr>
    </table>
   </div>