Need help

hi i need help with my plugin basicaly its an uploader that renames the fille that’s been uploaded but it dont seem to upload the file can you tell me whats wrong?

<?php
/*
Plugin Name: Comic Test
Plugin URI: http://ww.wp.xz.cn
Description: Menu Test
Author: Nobody
Author URI: http://example.com
*/

add_action('admin_menu', 'mt_add_pages');

function mt_add_pages() {

    add_menu_page('Comic Uploader', 'Comic Uploader', 8, __FILE__, 'com_tl_page');
	 add_submenu_page(__FILE__, 'Test 7', 'Test 7', 7, 'sub-page', 'com_lv7_page');

}

function com_tl_page() {
    echo "<h2>Test Toplevel</h2>";
echo '<br />You are here http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);
echo '<br />'.$_SERVER['DOCUMENT_ROOT'];
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$date = $_POST['date'];
// Your file name you are uploading
$file_name = $HTTP_POST_FILES['ufile']['name'];

// random 4 digit to add to our file name
// some people use date and time in stead of random digit
$random_digit=rand(0000,9999);

//combine random digit to you file name to create new file name
//use dot (.) to combile these two variables

$new_file_name=$date.$file_name;
$npath = 'http://'.$_SERVER['HTTP_HOST'];

//set where you want to store files
//in this example we keep file in folder upload
//$new_file_name = new upload file name
//for example upload file name cartoon.gif . $path will be upload/cartoon.gif
$path=$npath."/comics/".$new_file_name;
if($ufile !=none)
{
if(copy($HTTP_POST_FILES['ufile']['tmp_name'], $path))
{
echo "Successful<BR />";

//$new_file_name = new file name
//$HTTP_POST_FILES['ufile']['size'] = file size
//$HTTP_POST_FILES['ufile']['type'] = type of file
echo "File Name :".$new_file_name."<BR />";
echo "File Size :".$HTTP_POST_FILES['ufile']['size']."<BR />";
echo "File Type :".$HTTP_POST_FILES['ufile']['type']."<BR />";
}
else
{
echo "<br />Error :".$path."<br />";
echo "File Name :".$file_name."<BR />";
}
}
}
else {
?>
<table width="500" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form action="<?php echo str_replace( '%7E', '~', $_SERVER['REQUEST_URI']); ?>" method="post" enctype="multipart/form-data" name="form1" id="form1">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
<tr>
<td colspan="2"><strong>Comic Upload </strong></td>
</tr>
<tr>
  <td>Date to be first shown:</td>
  <td><input name="date" type="text" id="date" value="YYYY-MM-DD"></td>
</tr>
<tr>
<td width="23%">Select file</td>
<td width="77%"><input name="ufile" type="file" id="ufile" size="50" /></td>
</tr>

<tr>
  <td colspan="2" align="center"><input type="submit" name="Submit" value="Upload" /></td>
</tr>
</table>
</td>
</form>
</tr>
</table>
<?
}
}
function com_lv7_page() {
echo "This tab only appears if you're level 7 or more in other words editor and more";
}

?>