revised .vimrc

let g:NERDTreeDirArrows=0
map <C-o> :NERDTreeToggle<CR>
set t_Co=88
colorscheme railscasts

set smartindent
set tabstop=2
set shiftwidth=2
set expandtab

inoremap ( ()<Esc>:call BC_AddChar(")")<CR>i
inoremap [ []<Esc>:call BC_AddChar("]")<CR>i
inoremap " ""<Esc>:call BC_AddChar("\"")<CR>i
inoremap { {}<Esc>:call BC_AddChar("}")<CR>i

nnoremap <C-Down> <C-W><C-J>
nnoremap <C-Up> <C-W><C-K>
nnoremap <C-Right> <C-W><C-L>
nnoremap <C-Left> <C-W><C-H>

function! BC_AddChar(schar)
 if exists("b:robstack")
 let b:robstack = b:robstack . a:schar
 else
 let b:robstack = a:schar
 endif
endfunction

function! BC_GetChar()
 let l:char = b:robstack[strlen(b:robstack)-1]
 let b:robstack = strpart(b:robstack, 0, strlen(b:robstack)-1)
 return l:char
endfunction