// возвращает cookie если есть или undefined
    function getCookie(name) {
            var matches = document.cookie.match(new RegExp(
              "(?:^|; )" + name.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, '\\$1') + "=([^;]*)"
            ))
            return matches ? decodeURIComponent(matches[1]) : undefined 
    }

    // уcтанавливает cookie
    function setCookie(name, value, props) {
            props = props || {}
            var exp = props.expires
            if (typeof exp == "number" && exp) {
                    var d = new Date()
                    d.setTime(d.getTime() + exp*1000)
                    exp = props.expires = d
            }
            if(exp && exp.toUTCString) { props.expires = exp.toUTCString() }

            value = encodeURIComponent(value)
            var updatedCookie = name + "=" + value
            for(var propName in props){
                    updatedCookie += "; " + propName
                    var propValue = props[propName]
                    if(propValue !== true){ updatedCookie += "=" + propValue }
            }
            document.cookie = updatedCookie

    }

    // удаляет cookie
    function deleteCookie(name) {
            setCookie(name, null, { expires: -1 })
    }