docs: function(e){
  	    // Check if we are talking about self or parent.
  	    if( this === e.target ||
  		container_id === jQuery(e.target).parent().attr('id') ||
  		container_id === jQuery(e.target).attr('id') ){
      		_update_start_pos(e);
      		// Bind to moving.
      		jQuery(container_div).bind('mousemove', _scroller);
  	    }
      	}