function checkFooter() {
	var footer = $('footer');
	var c = $('c');
	if (footer && c) {
		if (pageSize.windowHeight <= 850) {
			footer.hide();
			c.setStyle({marginTop:'0px', top:'0px'});
		}
		else {
			footer.show();
			c.setStyle({marginTop:'-425px', top:'50%'});
		}
	}
}
Event.observe(window, 'resize', function() {
	pageSize = WindowUtil.getPageSize();
	checkFooter();
});
Event.observe(document, 'dom:loaded', function() {
	pageSize = WindowUtil.getPageSize();
	checkFooter();
});