//window resizer
function resizeContainer() {
      var x = $('.main_wrapper');
      var header_x = $('.header');
      var w = $(window).width();
      if(w < 1600 && w > 0) { x.css("max-width", "900px");header_x.css("max-width", "900px");}
      else if(w < 5000 && w > 1600) { x.css("max-width", "1280px");header_x.css("max-width", "1280px");}
};

$(document).ready(resizeContainer);
$(window).resize(resizeContainer);