PHP - Adjust If Statement So Post Does Not Have To Include File.

Hello can anyone help with my code, it bombs out if I dont add in a file for attachment but i want to be able to add to the database with just comments (sometimes without a file) Any help appreciated!!!


$timestamp = time();
$tbl_name="guestbook"; // Table name
$email = $_REQUEST["email"];
$name = $_REQUEST["name"];
$comment = $_REQUEST["comment"];
$datetime = date("dmy");
$uploaddir = "upload/";
$filename = $timestamp.$file['file']['name'];
$filename = strtolower($filename);
$final_location = "$uploaddir$filename";
$pathinfo = pathinfo($_FILES['userfile1']['name']);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/pjpeg"))
&& ($_FILES["file"]["size"] < 2000000))
{
if ($_FILES["file"]["error"] > 0)
{
echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
}
else
{
echo "Upload: " . $filename . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";

if (file_exists($final_location))
{
echo $filename . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"],
$final_location);
echo "Stored in: " . $final_location . "<br>";

mysql_connect("$host", "$username", "$password")or die("cannot connect server ");
mysql_select_db("$db_name")or die("cannot select DB");

$sql="INSERT INTO $tbl_name(name, email, comment, datetime, upload)VALUES('$name', '$email', '$comment', '$datetime', '$final_location')";
$result=mysql_query($sql);
}
}
//}
else
{
echo "Invalid file";
}

if($result){
echo "Successful added update to the Board";
echo "<BR>";
echo "<a href='HomePage4.php'>View Bulletin Board</a>"; }

else {
echo "ERROR";
}

mysql_close();
?>