Change to new keybinding, and disable original binding?

[qingshuizheng]

Hi there,

How to change a function to new keybinding, and disable the original keybinding?

Say, I want to bind the 'Change scroll target' keybinding to 'd', and disable the original 'cs' binding.

I have tried this, but did not work:
mapkey('d', '#2Change scroll target', function() { changeScrollTarget(); });

I also tried this, but both 'd' and 'cs' exist:
map('d', 'cs'); unmap('cs');

Thanks for any help and suggestion.
Zheng.

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Edited: the 2nd method works. But I prefer to use the first one. Thanks for any help.