function setCookie(name, value, expiredays) {
    var todayDate = new Date();
    todayDate.setDate(todayDate.getDate() + expiredays);
    document.cookie = name + "=" + escape(value) + "; path=/; expires=" + todayDate.toGMTString() + ";"
}
function closeWin() {
    if (document.popup_form.chkbox.checked) {
        setCookie("maindiv", "done", 1);
    }
    document.all['divpop'].style.visibility = "hidden";
}