new .Xdefaults and added F12 map to vimrc

.vimrc

@@ -3,6 +3,7 @@ filetype on
 set background=dark
 set showcmd
 set hlsearch
+let g:solarized_termcolors=256
 colorscheme solarized ".vim/colors/solarized.vim 
 
 " Jump to last position in file when reopening
@@ -10,5 +11,12 @@ if has("autocmd")
  au BufReadPost * if line("'\"") > 1 && line("'\"") <= line("$") | exe "normal! g'\"" | endif
 endif
 
+" Switch between light/dark backgrounds
+" F12 toggles between light and dark backgrounds
+map <silent> <F12> :if &background == "light"<CR>
+      \set background=dark<CR>
+      \else<CR>
+      \set background=light<CR>
+      \endif<CR>
 set t_Co=256