I installed a php script on my site called u-blog. During the script-controlled setup, the script created two directories, labeled "images" and "tmp" with permissions set at 751 and 771 respectively. The script encountered an error during setup and said that I would have to remove and re-install it. As I tried to do this, the two new directories could not be removed, nor could I change permissions (I assumed the permissions were part of the problem). Any ideas how I can get rid of them?