java中隔行变色

<style>
table tr
{
  background-color:expression(this.rowIndex%2==0 ? "#ffffff" : "#c0c0c0");
}
style>
<script>
var oldTd,oldTdText;
window.onload=function(){
  var table1 = document.getElementById("table1");
  var rows = table1.rows;
  for(i=0; i<rows.length; i++)
    {
      rows[i].cells[0].onmouseover=function(){
        if(oldTd)
        {
          oldTd.innerHTML=oldTdText;
        }
        oldTd=this;
        oldTdText=this.innerHTML;
        this.innerHTML=""+this.innerHTML+"";
      };
    }
}
script>
head>
<table id="table1" width="300" border="1" cellpadding="0" cellspacing="0" align="center" >
  <tr>
    <td>Line1Line1Line1Line1td>
  tr>
  <tr>
    <td>Line2Line2Line2Line2td>
  tr>
  <tr>
    <td>Line3Line3Line3Line3td>
  tr>
  <tr>
    <td>Line4Line4Line4Line4td>
  tr>
  <tr>
    <td>Line5Line5Line5Line5td>
  tr>
table>