Scroll an element with the page with a debounced event.

gistfile1.txt

jQuery(document).ready( function(){

jQuery(window).scroll( function(){

if( jQuery(window).scrollTop() > 1940 ){

  if( jQuery("#ss-ad").css("position") == "absolute" ){
	  
	  if( window.criteoTimer ){
		window.clearTimeout( window.criteoTimer );
	  }
	  
	  window.criteoTimer = window.setTimeout(function(){
		jQuery("#ss-ad").animate( {"top": (jQuery(window).scrollTop() - 300)} );
	  }, 300);
	  
  }else{

	  jQuery("#ss-ad").css(
		{position: "absolute", top: (jQuery(window).scrollTop() - 300) + "px", right: "10px"}
	  );
	   
  }
}else{
	jQuery("#ss-ad").css( {position: "relative", top: "", right: ""} );
}

});

});