$(document).ready(function() {
    $('.contactForm').click(function() {
        showBackground();
        showForm();
    });
});
function showBackground() {
    $('.modalBackground').show();
};
function showForm() {
    var left = (document.body.clientWidth - 940) / 2 + "px";
    var top = (document.body.clientHeight - 555) / 2 + "px";
    $('.modalPopup').css('top', top);
    $('.modalPopup').css('left', left);
    $('.modalPopup').css('zIndex', 999);
    $('.modalPopup').show();
};
function closeForm() {
    $('.modalBackground').hide();
    $('.modalPopup').hide();
    return false;
}