let g:focuscolour = 0
function! ToggleFocusColor()
if (g:focuscolour)
colorscheme desert
let g:focuscolour = 0
else
colorscheme focus-dark
let g:focuscolour = 1
endif
endfunc
"Set F6 to toggle
nmap <silent> <F6> :call ToggleFocusColor()<CR>