鼠标划过时整行变色

<script> function overIt(){ var the_obj = event.srcElement; if(the_obj.tagName.toLowerCase() == "td"){ the_obj=the_obj.parentElement; the_obj.oBgc=the_obj.currentStyle.backgroundColor; the_obj.oFc=the_obj.currentStyle.color; the_obj.style.backgroundColor='red'; the_obj.style.color='blue'; the_obj.style.textDecoration='underline'; } } function outIt(){ var the_obj = event.srcElement; if(the_obj.tagName.toLowerCase() == "td"){ the_obj=the_obj.parentElement; the_obj.style.backgroundColor=the_obj.oBgc; the_obj.style.color=the_obj.oFc; the_obj.style.textDecoration=''; } } </script> <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]