function modal(name) {
    var id = name;
    var maskHeight = $(document).height();
    var maskWidth = $(window).width();
    $('#mask').css({
        'width':maskWidth,
        'height':maskHeight
    });
    $('#mask').fadeIn(10);
    $('#mask').fadeTo('10',0.5);
    var winH = $(window).height();
    var winW = $(window).width();
    $(id).css('top',  winH/2-$(id).height()/2);
    $(id).css('left', winW/2-$(id).width()/2);
    $(id).fadeIn(10);

    $('.window .close').click(function (e) {
        e.preventDefault();
        $('#mask, .window').hide();
    });

    $('#mask').click(function () {
        $(this).hide();
        $('.window').hide();
    });
}