I have a Mac Pro desktop and a Macbook Pro laptop. Love both of them, but have a major problem with the DELETE key. Explain this please.... On the Mac Pro desktop the DELETE key works by deleting text from the first letter foward. On a Macbook Pro the DELETE key works by deleting text from the last letter backwards (which I hate!) Is this common? Is there a way to fix the DELETE key so it deletes in the manner I prefer? Thanks!