鼠标划过时整行变色_JavaScript

<table border="1" width="400" onmouseover="overIt()" onmouseout="outIt()"> <tr bgcolor="#111111"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#222222"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#333333"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#444444"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#555555"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#666666"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#777777"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#888888"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#999999"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#aaaaaa"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#bbbbbb"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#cccccc"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#dddddd"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#eeeeee"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> <tr bgcolor="#ffffff"> <td>aaa</td> <td>aaa</td> <td>aaa</td> <td>aaa</td> </tr> </table>
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]