var options =
  // horizontal Dock with images expanding downwards in the vertical axis...
{ align: 'bottom'
  // set the maximum minor axis (vertical) image dimension to 48px
, size: 48
  // add labels..
, labels: true
, distance: 54
  // swap the GIF extension for PNG extension for the larger image...
};
$(this).jqDock(options);
jQuery(document).ready(function(){
  jQuery('#menu').jqDock(options);
});