Jquery Save Cookie

<script type="text/javascript" src="../jquery.js"></script>
/**Jquery Cookie***/
jQuery.cookie = function(name, value, options) {
    if (typeof value != 'undefined') { // name and value given, set cookie
        options = options || {};
        if (value === null) {
            value = '';
            options.expires = -1;
        }
        var expires = '';
        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
            var date;
            if (typeof options.expires == 'number') {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            } else {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
        }
        var path = options.path ? '; path=' + (options.path) : '';
        var domain = options.domain ? '; domain=' + (options.domain) : '';
        var secure = options.secure ? '; secure' : '';
        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    } else {
        var cookieValue = null;
        if (document.cookie && document.cookie != '') {
            var cookies = document.cookie.split(';');
            for (var i = 0; i < cookies.length; i++) {
                var cookie = jQuery.trim(cookies[i]);
                if (cookie.substring(0, name.length + 1) == (name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }
};
//设置Cookie
function setCookie() {
var pwdvalue = $("#pwd")[0].value;
$.cookie('userid', pwdvalue);
alert(pwdvalue);
/*var Days = 30;  
    var exp  = new Date();  
    exp.setTime(exp.getTime() + Days*24*60*60*1000);  
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  */
}
//得到Cookie 
function getCookie(){  
    alert($.cookie('userid'));
    /*var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));   
    if(arr != null){  
        return unescape(arr[2]);  
    }else{  
        return "";  
    }   */
}