$(document).ready(function()
{ 
  /*BANNER*/
	
	var skyscraperAd = $("#skyscraper");
	var skyscraperOffset = skyscraperAd.offset().top;
	var skyscraperBottom = $("#copyright").offset().top - skyscraperAd.height();
	
	$(window).scroll(function() {
		skyscraperAd.stop();
		var windowTop = $(window).scrollTop() + 10;
		if (windowTop > skyscraperOffset)
    {
			if (windowTop > skyscraperBottom) windowTop = skyscraperBottom;
			if (windowTop < 0) windowTop = 0;
			skyscraperAd.animate({top: windowTop + 'px'}, 'fast');
		} else
			skyscraperAd.animate({top: skyscraperOffset + 'px'}, 'fast');
	});
});