new cookie clearing script

gistfile1.js

<script>

(function() {

    function setCookie(name, value, days) {
        var expires;
        if (days) {
          var date = new Date();
          date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
          expires = "; expires=" + date.toGMTString();
        } else {
          expires = "";
        }
        document.cookie = name + "=" + value + expires + "; path=/";
    }

    function removeCookie(name) {
        setCookie(name, "", -1);
    }

    function getCookieNames() {
        var ret = [];
        var cookieStrings = document.cookie.split(';');
        var currentCookieString = '';

        for(var i = 0; i < cookieStrings.length; i++) {
            currentCookieString = cookieStrings[i];
            ret.push(currentCookieString.substring(0, currentCookieString.indexOf('=')));
        }

        return ret;
    }

    function removeAllQTagCookies() {

        var cookieNames = getCookieNames();
        var cookieName;

        for(var l = cookieNames.length; l--;) {
            cookieName = cookieNames[l];
            if (cookieName.indexOf('qtag_') >= 0) {
                removeCookie(cookieName);
            }
        }
    }

    removeAllQTagCookies();
})();

</script>