var centered = false;

function recentre(forceresize) {
	var ctvh = $('#verticalAlign').height();
	if(centered) {
		if($(window).height() <= ctvh) {
			$('#verticalAlign').css('margin-top', 0).css('top',0);
			centered = false;
		} else {
			if(!forceresize) {
				$('#verticalAlign').css('margin-top', (0 - ctvh / 2)).css('top','50%');
				centered = true;
			}
		}
	} else {
		if($(window).height() < ctvh) {
			if(!forceresize) {
				$('#verticalAlign').css('margin-top', 0).css('top',0);
				centered = false;
			}
		} else {
			$('#verticalAlign').css('margin-top', (0 - ctvh / 2)).css('top','50%');
			centered = true;
		}
	}
}

$(function() {
	$(window).resize(function() { recentre(false); });
	recentre(true);
});