[jQuery] Message didn't disappear in validation plugin

[Adods]

I use jquery validation plugin 1.5.5, and got problem with error
message. They don't disappear when the form is valid or when i use
multiple rules, second rule message didn't show, the message is still
the first rule message.

Here's the code:
$(document).ready(function () {
        $('#user_form').validate({
                rules : {
                        username : {
                                required : true,
                                min : 4,
                                max : 32
                        },
                        password : {
                                required : true,
                                min : 6
                        },
                        password_again : {
                                required : '#password:filled',
                                min : 6,
                                equalTo : '#password'
                        },
                        name : 'required',
                        email : {
                                required : true,
                                validEmail : true
                        }
                }
        });
});

when username is empty, required rule message appear properly, so when
username less than 4 char, but when i fill username with 4 or more
chars the min rule message still appear. email too, when it's blank,
required rule message appear, but when i put invalid email the message
still required rule message.

and here is my validEmail method:
$.validator.addMethod('validEmail', function (value, element) {
        var emailStr = value;
        var checkTLD=1;
        var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|
coop|info|pro|museum)$/;
        var emailPat=/^(.+)@(.+)$/;
        var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
        var validChars="\[^\\s" + specialChars + "\]";
        var quotedUser="(\"[^\"]*\")";
        var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
        var atom=validChars + '+';
        var word="(" + atom + "|" + quotedUser + ")";
        var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
        var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
        var matchArray=emailStr.match(emailPat);

        if (matchArray==null) {
                //alert("Email address seems incorrect (check @ and .'s)");
                return false;
        }

        var user=matchArray[1];
        var domain=matchArray[2];

        for (i=0; i<user.length; i++) {
                if (user.charCodeAt(i)>127) {
                        //alert("Ths username contains invalid characters.");
                        return false;
                }
        }
        for (i=0; i<domain.length; i++) {
                if (domain.charCodeAt(i)>127) {
                        //alert("Ths domain name contains invalid characters.");
                        return false;
                }
        }

        if (user.match(userPat)==null) {
                //alert("The username doesn't seem to be valid.");
                return false;
        }

        var IPArray=domain.match(ipDomainPat);

        if (IPArray!=null) {
                for (var i=1;i<=4;i++) {
                        if (IPArray[i]>255) {
                                //alert("Destination IP address is invalid!");
                                return false;
                        }
                }
                return true;
        }

        var atomPat=new RegExp("^" + atom + "$");
        var domArr=domain.split(".");
        var len=domArr.length;

        for (i=0;i<len;i++) {
                if (domArr[i].search(atomPat)==-1) {
                        //alert("The domain name does not seem to be valid.");
                        return false;
                }
        }

        if (checkTLD && domArr[domArr.length-1].length!=2 && domArr
[domArr.length-1].search(knownDomsPat)==-1) {
                //alert("The address must end in a well-known domain or two 
letter "
+ "country.");
                return false;
        }

        if (len<2) {
                //alert("This address is missing a hostname!");
                return false;
        }

        return true;
}, 'Email is not valid');