function addEvent(elm, evType, fn) {
        if (elm.addEventListener) {
                elm.addEventListener(evType, fn, false);
        } else if (elm.attachEvent) {
                elm.attachEvent('on' + evType, fn);
        } else {
                elm['on' + evType] = fn;
        }
}

function addClass(o, c){
        var re = new RegExp("(^|\\s)" + c + "(\\s|$)", "g")
        if (re.test(o.className)) return
        o.className = (o.className + " " + c).replace(/\s+/g, " ").replace(/(^ | $)/g, "")
}

function removeClass(o, c){
        var re = new RegExp("(^|\\s)" + c + "(\\s|$)", "g")
        o.className = o.className.replace(re, "$1").replace(/\s+/g, " ").replace(/(^ | $)/g, "")
}

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

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
}

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