paging.js

$(document).keydown(function(e){
    // Ignore the keypress if any meta keys were pressed along with the arrows
    if(e.metaKey || e.ctrlKey || e.altKey || e.shiftKey) return;

    // Left arrow
    if(e.keyCode == 37) { 
      // Find a rel="prev" link on the page
      if($("a[rel='prev']").length > 0){
        // Highlight it briefly 
        $("a[rel='prev']").addClass('hover');
        // Navigate to the page
        window.location.href = $("a[rel='prev']").attr('href');
      }
      return false;
    }

    // Right arrow
    if(e.keyCode == 39) {
      // Find a rel="next" link on the page
      if($("a[rel='next']").length > 0){
        // Highlight it briefly 
        $("a[rel='next']").addClass('hover');
        // Navigate to the page
        window.location.href = $("a[rel='next']").attr('href');
      }
      return false;
    }
});