Downloading files does not work in IE and Firefox

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I have the following code to upload a file to the server. For some weird reason, it does not work in IE and Mozilla Firefox but works perfect in Chrome. What is the problem?

PHP:

// Check post_max_size (http://us3.php.net/manual/en/features.file-upload.php#73762)
    $POST_MAX_SIZE = ini_get('post_max_size');
    $unit = strtoupper(substr($POST_MAX_SIZE, -1));
    $multiplier = ($unit == 'M' ? 1048576 : ($unit == 'K' ? 1024 : ($unit == 'G' ? 1073741824 : 1)));

    if ((int)$_SERVER['CONTENT_LENGTH'] > $multiplier*(int)$POST_MAX_SIZE && $POST_MAX_SIZE)
        HandleError('File exceeded maximum allowed size. Your file size <b>MUST NOT</b> be more than 100kb.');

// Settings
    $save_path = 'uploads/'; //getcwd() . '/uploads/';The path were we will save the file (getcwd() may not be reliable and should be tested in your environment)
    $upload_name = 'userfile';                          // change this accordingly
    $max_file_size_in_bytes = 102400;               // 100k in bytes
    $whitelist = array('jpg', 'png', 'gif', 'jpeg');    // Allowed file extensions
    $blacklist = array('php', 'php3', 'php4', 'phtml','exe','txt','scr','cgi','pl','shtml'); // Restrict file extensions
    $valid_chars_regex = 'A-Za-z0-9_-\s ';// Characters allowed in the file name (in a Regular Expression format)

// Other variables
    $MAX_FILENAME_LENGTH = 260;
    $file_name = $_FILES[$upload_name]['name'];
    //echo "testing-".$file_name."<br>";
    //$file_name = strtolower($file_name);
    ////////$file_extension = end(explode('.', $file_name));

    $parts = explode('.', $file_name);
    $file_extension = end($parts);

    $uploadErrors = array(
        0=>'There is no error, the file uploaded with success',
        1=>'The uploaded file exceeds the upload max filesize allowed.',
        2=>'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
        3=>'The uploaded file was only partially uploaded',
        4=>'No file was uploaded',
        6=>'Missing a temporary folder'
    );

// Validate the upload
    if (!isset($_FILES[$upload_name]))

        **HandleError('No upload found for ' . $upload_name);**//THROWS UP ERROR HERE in IE and Firefox

    else if (isset($_FILES[$upload_name]['error']) && $_FILES[$upload_name]['error'] != 0)
        HandleError($uploadErrors[$_FILES[$upload_name]['error']]);
    else if (!isset($_FILES[$upload_name]['tmp_name']) || [email protected]_uploaded_file($_FILES[$upload_name]['tmp_name']))
        HandleError('Upload failed.');
    else if (!isset($_FILES[$upload_name]['name']))
        HandleError('File has no name.');

HTML:

<form name="upload" action="/upload" method="POST" ENCTYPE="multipart/formdata">
        <table border="0" cellpadding="3" cellspacing="3" class="forms">
          <tr>
           <tr>
           <td style="height: 26px" align="center">
<font class="font_upload_picture">'.MSG142.': <input class="font_upload_picture" type="file" name="userfile">
<input type=hidden name=MAX_FILE_SIZE value=102400 />
           </td>
          </tr>
          <tr>
            <td colspan="2">
                   <p align="center">
                                <input type="image" name="upload" value="upload" src="/img/layout/btnupload.gif" border="0" />
                              </p>
                              <p>&nbsp;</p>
                              <td><a href="/picturecamerasettings"><img src="/img/layout/takepicture.gif" border="0" /><br> '.MSG143.'</a></td>
                              </tr>
        </table>
        </form>


The enctype of the form should be multipart/form-data