// ***********************************************************************************
// script (c) and written by Radek HULAN
// http://hulan.cz/
// ***********************************************************************************

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