Floating block using JQuery 


 $(function() {
  var fixedelement = $("#left_fixed_div");  
  var offset = fixedelement.offset(); 
  var topPadding = 15;
  $(window).scroll(function() {
  if ($(window).scrollTop() > offset.top) {
    fixedelement.stop().animate({marginTop: $(window).scrollTop() - offset.top + topPadding});
  }
  else {
    fixedelement.stop().animate({marginTop: 0});
  };});
});

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