HJÆLP!

Jeg er ved at lave en upload form.

Dette er upload.php

<?php
session_start();
$class = $_SESSION['class'];
$fullname = $_SESSION['fullname'];
$task = $_POST['hwname'];
$file = $_FILES['uploadedfile']['name'];
if(isset($_SESSION['loggedin'])){
if(isset($file)){
echo "Afleverer....";
$target_path = "files/$task - $fullname - $file";
$target_path = $target_path . basename($_FILES['fil']['name']);

if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
    echo "<br />Filen er blevet afleveret.";
   
$filepath = "http://skoleintra.nasjn.net/files/$task - $fullname - $file";
$date = date('m-d-Y');
include('./config/mainconfig.php');
mysql_select_db("skoleintra");
mysql_query("INSERT INTO `files` (`name`, `class`, `subject`, `student`, `date`, `path`) VALUES ('$task', '$class', 'Dansk', '$fullname', '$date', '$filepath')");
echo "<script type=\"text/javascript\">
    <!--
    window.location = \"home.php#!homework\"
    //-->
    </script>";

}else{
    echo "<br />Der opstod en fejl!";
}
}
}else{
    echo "<script type=\"text/javascript\">
    <!--
    window.location = \"index.php?error=notloggedin\"
    //-->
    </script>";
}
 ?>

Hvorfor virker det kun på webkit?