Please helpme !! files problems..

Hi! Sorry for this stupid question but i am a begginer learning from a old book (dangerous combination), So i have to convert every example to not use old methods... I have to problems and i look every where and could not resolve. firstone: i have a form like this... <form enctype="multipart/form-data" action="_URL_" method="post"> Send this file: <input name="userfile" type="file"> <input type="submit" value="Send File"> </form> but i when i try to acces to $_FILES['userfile']['name'] for instance, seems to not exist... But the $_POST['userfile'] is working.. I look inte online manual and i doit exactly like describe but still not working... Any ideas ???? Second: I cant accoplish that my slack work with safe mode on... the user/group of the script php recognize like a -1/-1.... ¿?¿?¿? why? i try make a user/grup apache/apache to switch once started but still not working... Thaks in advance and please help... i don´t know other place to find the answers to this problems... Machine conf: -Slackware 8.1 - PHP v4.2.2 - Apache v2.0.39 -Windows XP Pro - PHP v4.2.2 - Apache v4.0.40