pero una pregunta
¿En que parte del codigo lo pongo?
<?php
$allowed_filetypes = array('.jpg','.gif','.bmp','.png');
$max_filesize = 524288;
$upload_path = './archivos/';
$filename = $_FILES['userfile']['name'];
$ext = substr($filename, strpos($filename,'.'), strlen($filename)-1);
if(!in_array($ext,$allowed_filetypes))
die('The file you attempted to upload is not allowed.');
if(filesize($_FILES['userfile']['tmp_name']) > $max_filesize)
die('The file you attempted to upload is too large.');
if(!is_writable($upload_path))
die('You cannot upload to the specified directory, please CHMOD it to 777.');
if(move_uploaded_file($_FILES['userfile']['tmp_name'],$upload_path . $filename))
echo 'Su archivo se a subido perfectamente, puede verlo <a href="' . $upload_path . $filename . '" title="Your File">aqui</a>'; // It worked.
else
echo 'There was an error during the file upload. Please try again.'; // It failed :(.
?>
saludos