title: ipython notebook navigate between cells
body: <p>is there a way in ipython notebook to navigate between cells which are far apart? For example if I have a large notebook and I want to move from a cell near the top of the notebook and then back to one at the bottom. Can I do this? I was thinking there might be a "goto cell 23" command or if not something similar to the mark command in vim.
  thanks</p>