var sw, sh;

window.onload = function() {
	$(window).resize(function(){
		windowResizeHandler();
	});
	windowResizeHandler();
}

function windowResizeHandler(){
	sw = window.innerWidth;
	sh = window.innerHeight;
		
	$('#wrapper').css({
		'top':(sh-600)/2+'px',
		'left':(sw-960)/2+'px'
	});
}