//Event.observe(document.onresize ? document : window, "resize", vcenter_page);
//document.observe('dom:load', vcenter_page);
Event.observe(document.onresize ? document : window, "resize", vcenter_page);
vcenter_page();

function vcenter_page()
{
	var page_height = $('page').getHeight(), body_height = $('body').getHeight();

	if(page_height < body_height)
		$('page').setStyle({top: ((body_height - page_height - 30) / 2) + 'px'});
	else
		$('page').setStyle({top: 0});
}