How can I close a Netrw :Explore buffer and return to the buffer I was last in?

I'm trying to write a function that will let me toggle a Netrw Explore window open/closed in the current window. Opening is easy, but closing (without killing the window/split) is a problem. Using <C-6> doesn't work if there's no alternate buffer, and my current implementation yields unpredictable results. Has anyone got an idea how I could pull this off? What I have so far, below:

fun! ExToggle(dir)
if &filetype != "netrw"
call ExOpen(a:dir)
else
call ExClose()
endif
endf

fun! ExOpen(dir)
exe "Explore " . a:dir
let g:netrw_browse_split=0 " open files in current window
endf

fun! ExClose()
while &filetype == "netrw"
exe "normal! \<C-O>"
endw
endf

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