急！！PHP5.3 POST 方法得不到值

很简单的代码
<html>
<head>
<title>Create new account</title>
</head>
<body>
<form action='TestForms.php' method='post'>
<table>
<tr>
<td width='150'>Full Name</td>
<td><input type='text' name='fullName' size='30'/></td>
</tr>
<tr>
<td width='150'> User Name</td>
<td><input type='text' name='userName' size='30'/></td>
</tr>
<tr>
<td colspan="2">
<input type='submit' value='submit'/>
</tr>
</table>
</form>
</body>
</html>TestForms.php
<html>
<head>
<title>Create new account</title>
</head>
<body>
<?php $FullName=$_POST['fullName'];
$UserName=$_POST['userName'];
?>
<p>
Full Name:<b><?php echo $FullName;?></b>
User Name:<b><?php echo $UserName;?></b>
</p>
</body>
</html>
结果是POST取不到值，是空！！！！！是不是配置文件有问题。。求高手指教