problem on file upload

Hi, I can upload files from local machine to the unix server under the current directory, but at the same time I want to create a new folder under the current directory and save the file into that folder. I just change the fopen($userfile_name[$i], "w" ) to fopen("upload//".$userfile_name[$i], "w" ). This does not work and I checked the file and directiory permission. But still I don't know why this does not work. Could anybody help me? Thank you very much. Mike __________________________________________________ Do You Yahoo!? Yahoo! Photos - Share your holiday photos online! http://photos.yahoo.com/