鼠标放在表格区域内，当前格的一整行和一整列变色

以下为详细代码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>表格的一整行与一整列在鼠标经过时变色 qwbm.com</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style type="text/css">
#senfe {width: 300px;height: 300px;border-top: 1px solid #000;border-left: 1px solid #000;}
#senfe td {border-right: 1px solid #000;border-bottom: 1px solid #000;}
</style>
<script type="text/javascript">
window.onload = function(){
 var td = document.getElementById("qwbmsenfe").getElementsByTagName("td");
  for(var i=0; i<td.length; i++){
   td[i].onmouseover = function(){
   for(var j=0; j<td.length; j++){
    if(td[j].cellIndex==this.cellIndex || td[j].parentElement.rowIndex==this.parentElement.rowIndex){
     td[j].style.backgroundColor="#000";
    }
   }
  }
  td[i].onmouseout = function(){
   for(var j=0; j<td.length; j++){
    if(td[j].cellIndex==this.cellIndex || td[j].parentElement.rowIndex==this.parentElement.rowIndex){
     td[j].style.backgroundColor="";
    }
   }
  }
 }
}
</script>
</head>
<body>
<table id="qwbmsenfe" width="90%" height="300" border="1" cellspacing="1" cellpadding="1">
<tr><td>　</td><td>　</td><td>　</td><td>　</td><td>　</td></tr>
<tr><td>　</td><td>　</td><td>　</td><td>　</td><td>　</td></tr>
<tr><td>　</td><td>　</td><td>　</td><td>　</td><td>　</td></tr>
<tr><td>　</td><td>　</td><td>　</td><td>　</td><td>　</td></tr>
<tr><td>　</td><td>　</td><td>　</td><td>　</td><td>　</td></tr>
</table> aaaaaaa
</body>
</html>