function revealModal(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";
}

function setCookie(c_name, value, expiredays) {
    var exdate = new Date(); exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" + escape(value) +
((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
}

function getCookie(c_name) {
    if (document.cookie.length > 0) {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1) {
            c_start = c_start + c_name.length + 1;
            c_end = document.cookie.indexOf(";", c_start);
            if (c_end == -1) c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return "";
}

function checkGreenGalaCookie() {
    username = getCookie('greengalacookie');

    if (username == null || username == "") 
    {
    //cookie already set... do nothing
        setCookie('greengalacookie', 'cookieset', 30);
        revealModal('modalPage')
    }    
   
}