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<script>
function changeTrStyle(tr) {
var tid=document.getElementById("myid") ;
tid.id="" ;
tr.id="myid" ;
}
</script>
<style>
#myid{font-size:16px;
font-family:Verdana,sans-serif;
background-color:#400000;
color:white;}
</style><em id="myid"></em>
<table border=1>
<tr onclick="changeTrStyle(this)" id=""> <td> 111 </td> <td> 111 </td> </tr>
<tr onclick="changeTrStyle(this)" id=""> <td> 111 </td> <td> 111 </td> </tr>
<tr onclick="changeTrStyle(this)" id="" > <td> 111 </td> <td> 111 </td> </tr>
<tr onclick="changeTrStyle(this)" id=""> <td> 111 </td> <td> 111 </td> </tr>
<tr onclick="changeTrStyle(this)" id=""> <td> 111 </td> <td> 111 </td> </tr>
</table>
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test</title>
<style type="text/css">
<!--
.class1 {
font-size:16px;
font-family:Verdana,sans-serif;
background-color:#400000;
color:white;
}
.class2 {
font-size:12px;
background-color:#CCC;
}
table {
border:1px solid #008000;
width:300px;
}
-->
</style>
<script type="text/javascript">
<!--
function changeTrStyle(tr) {
tr.className = "class1";
}
-->
</script>
</head>
<body>
<table>
<tr class="class2" onclick="changeTrStyle(this);"><td>111</td><td>111</td></tr>
<tr class="class2"><td>222</td><td>222</td></tr>
</table>
</body>
</html>