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});   };}); });