function revealModal(divID) {
    $('html').css('overflow', 'hidden');
    $('.ICModal').css('overflow-y', 'scroll');
    $('.ICModal').css('overflow-x', 'hidden');
    $('.modalBackground').css('right', scrollBarSize()+"px");
    $('.modalBackground').click(function() { hideModal(divID); });
    window.onscroll = function() { document.getElementById(divID).style.top = document.body.scrollTop; };
    document.getElementById(divID).style.display = "block";
    document.getElementById(divID).style.top = document.body.scrollTop;
}


function hideModal(divID) {
    document.getElementById(divID).style.display = "none";
    $('html').css('overflow', 'scroll');
}



function scrollBarSize() {
        document.body.style.overflow = 'hidden';
        var width = document.body.clientWidth;
        document.body.style.overflow = 'scroll';
        width -= document.body.clientWidth;
        if (!width) width = document.body.offsetWidth - document.body.clientWidth;
        document.body.style.overflow = '';
        return width;
    }