function verticalCenter() {
	var wapperHeight = $("#wapper").height();
	var windowHeight = $(window).height();
	var wapperTop = windowHeight > wapperHeight ? Math.round((windowHeight - wapperHeight) / 2) : 0;
	$("#wapper").css("margin-top", wapperTop + "px");
}

$(document).ready(function () {
    $(window).resize(verticalCenter);
    verticalCenter();
});