js实现闭合的marquee滚动
<div id="adsfar">
<table width="100%" border="0" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<td bgcolor="#FFFFFF">1</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">2</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">3</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">4</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">5</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">6</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">7</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">8</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">9</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">10</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">11</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">12</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">13</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">14</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">15</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">16</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">17</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">18</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">19</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">20</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">21</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">22</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">23</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">24</td>
</tr>
<tr>
<td bgcolor="#FFFFFF">25</td>
</tr>
<tr>
&nbs