Upload in Google Chrome not working

I am creating simple file upload (for pictures). I tried in Opera and in FireFox and uploading is working fine. But when I upload via Google Chrome, picture is not uploaded. Can you please tell me where is problem:

here is php script that is used for storing picture in database

<?php $id=$_SESSION['user_id']; $user_id=$_SESSION['user_id']; $album_id=$_POST['album']; $max_size = 500; // Sets maxim size allowed for the uploaded files, in kilobytes // sets an array with the file types allowed $allowtype = array('bmp', 'gif', 'htm', 'html', 'jpg', 'jpeg', 'mp3', 'pdf', 'png', 'rar', 'zip'); // if the folder for upload (defined in $updir) doesn't exist, tries to create it (with CHMOD 0777) /*if (!is_dir($updir)) mkdir($updir, 0777);*/ /** Loading the files on server **/ $result = array(); // Array to store the results and errors // if receive a valid file from server if (isset ($_FILES['files'])) { // checks the files received for upload $file_name=$_FILES['files']['name']; $file_type=$_FILES['files']['type']; $file_size=$_FILES['files']['size']; $file_tmp=$_FILES['files']['tmp_name']; for($f=0; $f<count($_FILES['files']['name']); $f++) { $file_name = $_FILES['files']['name'][$f]; $random_name=rand(); // checks to not be an empty field (the name of the file to have more then 1 character) if(strlen($file_name)>1) { // checks if the file has the extension type allowed $type=explode('.', $file_name); $type=end($type); if (in_array($type, $allowtype)) { // checks if the file has the size allowed if ($_FILES['files']['size'][$f]<=$max_size*1000) { // If there are no errors in the copying process if ($_FILES['files']['error'][$f]==0) { $query = mysql_query("SELECT username from users WHERE id = '$id' "); while($run=mysql_fetch_array($query)){ $username=$run['username']; } $query = mysql_query("SELECT album.name an from album WHERE album.id = '$album_id' "); while($run=mysql_fetch_array($query)){ $album_name=$run['an']; } mysql_query("INSERT INTO photos VALUE ('', '$album_id', '$random_name.jpg', '$user_id')"); // Sets the path and the name for the file to be uploaded // If the file cannot be uploaded, it returns error message if (move_uploaded_file ($_FILES['files']['tmp_name'][$f],"./users/".$username."/".$album_name."/".$random_name.".jpg")) { /*$result[$f] = ' The file could not be copied, try again';*/ $result[$f] = '<b>'.$file_name.'</b> - OK'; } else { $result[$f] = ' The file could not be copied, try again'; } } } else { $result[$f] = 'The file <b>'. $file_name. '</b> exceeds the maximum allowed size of <i>'. $max_size. 'KB</i>'; } } else { $result[$f] = 'File type extension <b>.'. $type. '</b> is not allowed'; } } } // Return the result $result2 = implode('<br /> ', $result); echo '<h4>Files uploaded:</h4> '.$result2; } ?> 

and here is form that is used for picture uploading:

 <form id="uploadform" action="uploaderimg.php" method="post" enctype="multipart/form-data" target="uploadframe" onSubmit="uploading(this); return false"> <br> Select album: <select name="album"> <?php $query=mysql_query("SELECT id, name, user_id FROM album WHERE user_id = '$id'"); while($run=mysql_fetch_array($query)){ $album_id=$run['id']; $album_name=$run['name']; $album_user = $run['user_id']; echo "<option value='$album_id'>$album_name</option>"; } ?> </select> <br /><br /> <h1>Chose your photo/s</h1> <br> <input type="file" name="files[]" /> <input type="submit" value="UPLOAD" id="sub" /> </form> 

EDIT:

THis is error according to PHP(it's in first script that store uploaded file):

Notice: Undefined index: album in..