hello there...

i really need help regarding to above matters..

i have a page like this...
<?
// you can change this to any directory you want
// as long as php can write to it
//$uploadDir = 'C:/webroot/upload/';
$uploadDir = '../prod-application/file/';

if(isset($_POST['upload']))
{
$fileName = $_FILES['userfile']['name'];
$tmpName = $_FILES['userfile']['tmp_name'];
$fileSize = $_FILES['userfile']['size'];
$fileType = $_FILES['userfile']['type'];
$register_id = $_FILES['userfile']['register_id'];
$title = $_FILES['userfile']['title'];

// get the file extension first
$ext = substr(strrchr($fileName, "."), 1);

// generate the random file name
$randName = md5(rand() * time());

// and now we have the unique file name for the upload file
$filePath = $uploadDir . $randName . '.' . $ext;

// move the files to the specified directory
// if the upload directory is not writable or
// something else went wrong $result will be false
$result = move_uploaded_file($tmpName, $filePath);
if (!$result) {
echo "Error uploading file";
exit;
}

include 'connectdb.php';
//include 'library/opendb.php';

if(!get_magic_quotes_gpc())
{
$fileName = addslashes($fileName);
$filePath = addslashes($filePath);
}

$name = $_POST['name'];
$size = $_POST['size'];
$type = $_POST['type'];
$path = $_POST['path'];
$register_id = $_POST['register_id'];
$title = $_POST['title'];

$query = "INSERT INTO upload2 (name, size, type, path,register_id,title ) ".
"VALUES ('$fileName', '$fileSize', '$fileType', '$filePath', '$register_id', '$title')";

mysql_query($query) or die('Error, query failed : ' . mysql_error());

include 'library/closedb.php';

echo "<br>File uploaded<br>";
}
?>
</span>
<form action="" method="post" enctype="multipart/form-data" name="uploadform">
<table width="491" border="0" cellpadding="1" cellspacing="1" class="box">
<tr>
<td width="411" class="style2">
<input type="hidden" name="MAX_FILE_SIZE" value="2000000">
<input name="userfile" type="file" class="style2" id="userfile" size="50">
</td>
<td width="71" class="style2">
<input name="upload" type="submit" class="style2" id="upload" value=" Upload ">
</td>
</tr>
</table>
<p><span class="style4">Work registration ID: <? echo $register_id;?>&nbsp;
<input name="register_id" type="hidden" id="register_id" value="<? echo $register_id;?>">
<br>
Title of Works: <? echo $title;?>
<input name="title" type="hidden" id="title" value="<? echo $title;?>">
</span> </p>
</form>
<p>
<input name="Submit" type="submit" class="style2" onClick="javascript:window.close();"value="Close">
</p></td>
</tr>
</table>
where by the user can upload their file into the system..the problem is..there's error to upload the file....my server have our own username and password..i need to set these thing into this page..how could i do that..could anyone help me??