I am in the habit of using both querty and dvorak keyboard mappings on my computer, and would like to make a function in vim, that remaps h to d, j to h, k to t, and l to n. I would also like a function that would switch the mappings back. I can handle the forward function, but am at a loss as to how I would unmap the previously defined mappings.
Vim dvorak users may be interested in this wiki page that tells you how to use dvorak in insert mode while keeping the command keys the same in normal mode:
Also, the (i|n|x|etc.)unmap commands unmap.