imagepacks, deleting, PSP 10

Hi! I just have a quick brush question. If this is already in the memories, than I do apologize. I have PSP 10 and have defined my brushes using imagepacks. I'm all set to go. Now my question is, do I have to keep the imagepacks on my hard drive or can I delete the files once I have defined the brushes in my PSP? If I delete the imagepack, will I lose my brushes? Thanks a whole lot in advance! Sorry for the n00b question-LOL!

x-posted.