(function () {
    var expDays = 30; // number of days the cookie should last 

    function GetCookie(name) {
        var arg = name + "=";
        var alen = arg.length;
        var clen = document.cookie.length;
        var i = 0;
        while (i < clen) {
            var j = i + alen;
            if (document.cookie.substring(i, j) == arg)
                return getCookieVal(j);
            i = document.cookie.indexOf(" ", i) + 1;
            if (i == 0) break;
        }
        return null;
    }

    function SetCookie(name, value) {
        var argv = SetCookie.arguments;
        var argc = SetCookie.arguments.length;
        var expires = (argc > 2) ? argv[2] : null;
        var path = (argc > 3) ? argv[3] : null;
        var domain = (argc > 4) ? argv[4] : null;
        var secure = (argc > 5) ? argv[5] : false;
        document.cookie = name + "=" + escape(value) +
	((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
	((path == null) ? "" : ("; path=" + path)) +
	((domain == null) ? "" : ("; domain=" + domain)) +
	((secure == true) ? "; secure" : "");
    }

    function DeleteCookie(name) {
        var exp = new Date();
        exp.setTime(exp.getTime() - 1);
        var cval = GetCookie(name);
        document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
    }

    var exp = new Date();
    exp.setTime(exp.getTime() + (expDays * 24 * 60 * 60 * 1000));

    function getCookieVal(offset) {
        var endstr = document.cookie.indexOf(";", offset);
        if (endstr == -1)
            endstr = document.cookie.length;
        return unescape(document.cookie.substring(offset, endstr));
    }

    function checkCount() {
        // Scope down the variables so any other javascript file does not change the value of page.
        var page = "/contents/survey.aspx"; // url of the survey
        var windowprops = "width=610,height=301,location=no,toolbar=no,menubar=no,scrollbars=yes"; // popup window parameters
        var surveycookiename = "RCSurveyMay2007";

        var randnum;
        var count = GetCookie(surveycookiename);
        if (count == null) {
            randnum = Math.round(Math.random() * 10);
            if (randnum == 1) {
                count = 1;
                SetCookie(surveycookiename, count, exp);
                window.open(page, "", windowprops);
            }
        }
        else {
            count++;
            SetCookie(surveycookiename, count, exp);
        }
    }
})();