function fixSkyPosition(banner, mainWidth, bannerWidth, isLeftOrRight) {
	if (($j(document).width() - mainWidth) / 2 < bannerWidth) {
		$j(banner).hide();
		return;
	}

	var left = isLeftOrRight == 'left' ?
		(($(document).width() - mainWidth) / 2 - bannerWidth) :
		(($(document).width() + mainWidth) / 2);
	var top = $(document).scrollTop();
	$(banner).show();
	$(banner).css('left', left + 'px');
	$(banner).animate({
		top: top + 'px'
	}, { duration: 'fast' });
}