function showBlockUi(sSelector) {
    jQuery.blockUI({
    message: jQuery(sSelector),
        overlayCSS: {
            backgroundColor: '#000',
            opacity: 0.75
        },
        css: {
            backgroundColor: '#EDE1EB',
            cursor: null,
            top: (((jQuery(window).height() - jQuery(sSelector).height()) / 2) - 20) + 'px',
            left: (jQuery(window).width() - jQuery(sSelector).width()) / 2 + 'px',
            width: (jQuery(sSelector).width()) + 'px'
        }
    });
}

function showModalWindow(sId) {
    showBlockUi("#" + sId);
    jQuery('.blockOverlay').attr('title', '').click(jQuery.unblockUI);
    return false;
}

function closeModalWindow() {
    jQuery.unblockUI();
    return false;
}