resenje.js

// /*jslint browser: true*/
// /*global $, jQuery, alert*/
// /*jshint strict: true */
// /*jslint vars: true, plusplus: true, devel: true, nomen: true, indent: 4, maxerr: 50 */
//

var counter = 0;
$(document).ready(function () {

  $('.clickable').on('click',function(){




if(counter%2 === 0){


    $(this)
        .find(".glyphicon-plus")
        .removeClass("glyphicon-plus")
        .addClass("glyphicon-minus");

  }else{

    $(this)
        .find(".glyphicon-minus")
        .removeClass("glyphicon-minus")
        .addClass("glyphicon-plus");

  }
counter++;


});



});