jquery.table-resizer.js

;(function($) {
  $.fn.resizable = function () {
    var mouseStartY     = null;
    var startHeight     = null;
    var resizableObject = $(this);
    var columnsCount    = $('tr:eq(0) th, tr:eq(0) td', resizableObject).length;

    resizableObject.append ('<tfoot><tr><td colspan="'+columnsCount+'" class="resize_bar"></tr></tfoot>');
    resizableObject.find   ('.resize_bar').mousedown (function (event) {
      if(event.preventDefault) // Prevent FF default d'n'drop
        event.preventDefault();
      mouseStartY = event.pageY;
      startHeight = _getViewport ().height ();
      $(document).mousemove (_drag).one ('mouseup', null, _drop);
    });
   
    function _drag (event) {
      var deltaY = event.pageY - mouseStartY; 
      _getViewport ().height (startHeight + deltaY)
    }

    function _drop (event) {
      $(document).unbind ('mousemove', _drag);
    }

    function _getViewport () {
      return $('tbody', resizableObject);
    }

    return resizableObject;
  };
})(jQuery);