File Upload Prob

[Anon]

I can't get PHP to recognize when a file has NOT been uploaded along w/ the form i have.

if ($resume == "none") { echo("boo yeah");/*do nothing */ }
									else{
										if (is_uploaded_file($resume)) { 
																		$fileloc = $resume_name;
										move_Uploaded_File($resume,$fileloc); 
										$message = $message . "Resume Submitted: " . $fileloc . "\r\n\r\n";
										}
									}

It always seems to hit this part of my code (and throws an error) regardelss if I choose a file to upload on the previous page or not.

Any help would be appreciated.
Thanks!