title: Implement keyboard control in JavaScript Grid
body: <p>I finished building a JavaScript grid control, end everything works fine. Paging, button navigation, column sorting, etc.</p>
  
  <p>The cells in the grid are DIVs which are generated using Mootools 1.2.4 (which is heavily used throughout the control).</p>
  
  <p>I want to implement keyboard control for the grid, both for paging (page up/page down) and for moving with arrow keys inside the rows/cells of the grid.
  I think that I have to attach an event handler on each cell of the grid and detect what key is being pressed in order to take an appropriate action. But, I can't set the focus on the cells.</p>
  
  <p>What am I missing? How do I do this? Any help is appreciated.</p>