(function() {
	var header	= $('branding');
	var logo	= $$('#branding a img')[0];
	
	var scroll = function(e) {
		var offset = window.pageYOffset;
		var position = (offset>165) ? 'fixed' : 'absolute';
		if (position!=header.getStyle('position')) {
			//header.setStyle({'position': position});
			header.setStyle({'position': position, 'top': (position == 'fixed') ? '-165px' : '0px'});
		}
	}
	
	logo.setStyle({'position': 'absolute'});
	
	scroll();
	Event.observe(window, 'scroll', scroll);
})();