moving uploaded files

Does anyone have a solution for the following problem. I use dbwired.com for hosting (great service). They do not, however, for obviously reasons allow the system() command from a php script. So, when I switched to this server I had to switch from a system("mv file1 file2"); command to a move_uploaded_file("path1","path2"); command which is fine...for uploading. But, once a file is uploaded I can't figure out a way to move or delete it as it is no longer considered an "uploaded file" and hence move_uploaded_file() fails. Does anyone know a way around this? Thanks. -Jon Mormino