jQuery(document).ready(function(){

   jQuery('.big-slider').bxSlider({
      mode: 'fade',
      speed: 1500,
      auto: true,
      pause: 5000,
      adaptiveHeight: true,
      nextText: '',
      prevText: '',
      nextSelector: '.slide-next',
      prevSelector: '.slide-prev',
      pager: false,
      autoHover: true
   });
 });