nmap <Leader>m <Plug>BookmarkToggle
nmap <Leader>mi <Plug>BookmarkAnnotate
nmap <Leader>ma <Plug>BookmarkShowAll
nmap <Leader>mj <Plug>BookmarkNext
nmap <Leader>mk <Plug>BookmarkPrev 
nmap <Leader>mc <Plug>BookmarkClear 
nmap <Leader>mx <Plug>BookmarkClearAll