upload file function

/* written by LiYongQuan */
    set_time_limit($TimeLimit);
    $FileName = AddSlashes($UploadPath).$FName;
    if(($UploadFile =="none") || ($UploadFile == ""))
{echo("You didn't choice any file!");
  return(1);
}
    if(($FileName =="none") || ($FileName == ""))
{echo("You didn't supply destination file!");
  return(2);
}
    $FileName = AddSlashes($UploadPath).$FName;
    if($UploadFile_size
    unlink($UploadFile);
    set_time_limit(30);
  }   
?>