Uploading files

Hi to all: I don`t konw very well php. I do examples everyday and solve some problems. But in other i need help. Today i want to upload a file. I have the form that you can find in the php manual. <form enctype="multipart/form-data" action="_URL_" method="POST"> <input type="hidden" name="MAX_FILE_SIZE" value="1000">Send this file: <input name="userfile" type="file"> <input type="submit" value="Send File"> </form> My problem is that i don´t know how to programe the php program that upload the file. I do a lot of examples, but not work. Can someone give me help. Thanks. Best regards, Diego