Applications :: Moving ITunes To External Hard Drive - Orignal Files Missing?

I recently bought a 160GB external hard drive, and decided to transfer my iTunes music to it. I followed the instructions in the Help section of the iTunes program. The first time, I mistakenly created an empty "iTunes" folder and put an "iTunes music" folder inside, where i proceeded to copy the files. I had already set the defult location of the library to my F: drive, my external hard drive. However, the original location of the files stayed in iTunes. Again, following the advice of the iTunes program, I deleted the original folders, and I dragged the new iTunes music folder into the window - at which point i had TWO copies of each file - the first one with an exclamation beside it (original file missing) and the second being my new copies.