Something

<title>Image Upload</title>
<form name="upload" method="post" action="" enctype="multipart/form-data">
<input type="file" name="imagefile" />
<br />
<input type="submit" name="submit" value="Upload!" /><br /><br />
<?php
$unique = md5(time());
$name = substr($unique,1,6);
$ext = '.wmv';

if (isset($_POST['submit'])) 
{
    $tmp_name = $HTTP_POST_FILES['imagefile']['tmp_nme'];
    echo "the full name is".$tmp_name;
    $ext = explode(".", $tmp_name);
    if ($ext == 'wmv'){
        ?>
        <div id="uploading"><img src="circle-ball-dark-antialiased.gif> Uploading...</div>
        <?php 
        copy($_FILES['imagefile']['tmp_name'], "images/" . $name.$ext) or die ("Could not copy"); 
        ?>
        <script>
        document.getElementById('uploading').innerHTML = 'Upload Complete.';
        </script>
        <?php 
    } 
    else{
        echo "Could not copy, Wrong file type";
    }    
}
?>