How to launch kdiff3 to compare 2 neighbouring windows in VIM

Hi
I am trying to launch kdiff3 to compare two neighbouring windows in vim,
could some one suggest me a solution?
Currently my idea is trying to use " register to save the file name of the
first window, and use %:p to get current file name, and then call kdiff3 to
compare these two windows.
But somehow, it does not work. Could someone help me with this issue?
As shown bellow

[code]nnoremap <leader>1 :let @"=expand("%:p")<CR>

function! CompareTwoFiles()
!kdiff3 "" expand("%:p")
endfunc

nnoremap <leader>2 :call CompareTwoFiles()<cr> [/code]




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