/* edge, pretty CSS */
jQuery.fn.extend({

/* create horizontal edge DIV */
  createHorizEdge: function() {
    return this.each(function() {
      s = $('*', this).first();
      s.before('<div class="left_edge"></div>');
      s.before('<div class="right_edge"></div>');
    });
  }

});

/*
  Apply example:

  $('.button').createHorizEdge();

*/

$(document).ready(function(){
  $('.button').createHorizEdge();
});