jQuery(document).scroll(function(eventData) {
  if(jQuery('#left_block').height() < jQuery('#right_block').height()) return;
  var scroll = jQuery(window).scrollTop();
  
  var margin = 160;
  var position = "relative";

  if(scroll > 130) {
    margin = 0;
    position = "fixed";
  }
  
  jQuery('.tag-cloud').css("position", position);
  jQuery('.tag-cloud').css("margin-top", margin + 'px');
//  if(jQuery(window).scrollTop() > 170;
});