// skycrapper
function floatSkyscraper() {
  var margin = $(window).scrollTop() - 440; //odkud začne rolovat
  var footer = $("#class").offset().top - 440;  //800
  if (margin > footer) margin = footer;
  if (margin < 5) margin = 5;
  $('#noscroll').animate({marginTop: margin + 'px'}, 'fast');
}


$(document).ready(function() {
$(window).scroll(function() { $('#noscroll').stop(); floatSkyscraper(); });
});