$(window).resize(function(){
	var h1 = document.getElementById("wrapper").offsetHeight;
	var h2 = h1-250; 
	document.getElementById('container').style.height=h2+"px";

    var boxHeight = $(".box").outerHeight() - 205;
    var itemHeight = $(".main").outerHeight();
    var newPagTop = (boxHeight/2) - (itemHeight/2);
    $('.main').css('margin-top', newPagTop + 'px');
});