function getCookie(sName) {
    var oRegex = new RegExp("(?:; )?" + sName + "=([^;]*);?");

    if (oRegex.test(document.cookie)) {
        return unescape(RegExp["$1"]);
    } else {
        return null;
    }

}

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

function eraseCookie(sName) {
    setCookie(sName,"",-1);
    return null;
}