Vertically and horizontally align a div within window

vertical-center.js

// .well.login-inbox {margin:0px auto; }
    function mathVert(el) {
         var windowHeight = $(window).height();
         var elheight = $(el).innerHeight();
         var elmath = (windowHeight / 2) - (elheight / 2);
    return elmath;
    }

    function varticalCenterStuff() {
        $('.login-box').css('margin-top', mathVert('.login-box'));
        $('.register-box').css('margin-top', mathVert('.register-box'));
        $('.info-box').css('margin-top', mathVert('.info-box'));
    }
    $(window).resize(function () {
        varticalCenterStuff();
    });
    varticalCenterStuff();