String.prototype.trim = function() {

    return this.replace(/^\s+/, '').replace(/\s+$/, '');

}

function stub() {

}



function commonGet(id) {

    return document.getElementById(id);

}



function commonValidId(id) {

    return (id && commonGet(id));

}



function commonShow(id) {

    if (commonValidId(id)) {

        commonGet(id).style.display = 'block';

    }

}



function commonHide(id) {

    if (commonValidId(id)) {

        commonGet(id).style.display = 'none';

    }

}



function commonProcessFieldError(fieldName, errorId) {

    for (var i = 0; i < 10; i++) {

        commonHide(fieldName + '_error_' + i);

    }

    commonShow(fieldName + '_' + errorId);

    return (errorId == null);

}



function commonValidateRequired(form, fieldName, errorCode) {

    if (!form[fieldName]) {

        return true;

    }

    if (form[fieldName].value.trim().length == 0) {

        return commonProcessFieldError(fieldName, errorCode);

    } else {

        return commonProcessFieldError(fieldName, null);

    }

}



function commonValidateMinLength(form, fieldName, length, errorCode) {

    if (!form[fieldName]) {

        return true;

    }

    if (form[fieldName].value.trim().length < length) {

        return commonProcessFieldError(fieldName, errorCode);

    } else {

        return commonProcessFieldError(fieldName, null);

    }

}



function commonValidateSymbols(form, fieldName, errorCode) {

    if (!form[fieldName]) {

        return true;

    }

    if (form[fieldName].value.trim().length == 0) {

        return commonProcessFieldError(fieldName, null);

    }

    var symbols = /^[A-Za-z0-9._\-@]+$/;

    if (!symbols.test(form[fieldName].value)) {

        return commonProcessFieldError(fieldName, errorCode);

    } else {

        return commonProcessFieldError(fieldName, null);

    }

}



function commonValidatePasswords(form, fieldName1, fieldName2, errorCode) {

    if (!form[fieldName1] || !form[fieldName2]) {

        return true;

    }

    if (form[fieldName1].value != form[fieldName2].value) {

//        return commonProcessFieldError(fieldName2, errorCode);
        return commonProcessFieldError(fieldName2, null);

    } else {

        return commonProcessFieldError(fieldName2, null);

    }

}



function commonValidateEmail(form, fieldName, errorCode) {

    if (!form[fieldName]) {

        return true;

    }

    if (form[fieldName].value.trim().length == 0) {

        return commonProcessFieldError(fieldName, null);

    }

    var email = /^\w[\w\-]*(\.\w[\w\-]*)*@\w[\w\-]+(\.\w[\w\-]+)*\.(a[c-gil-oq-uwz]|b[a-bd-jm-or-tvwyz]|c[acdf-ik-orsuvx-z]|d[ejkmoz]|e[ceghr-u]|f[i-kmorx]|g[abd-ilmnp-uwy]|h[kmnrtu]|i[delm-oq-t]|j[emop]|k[eg-imnprwyz]|l[a-cikr-vy]|m[acdghk-z]|n[ace-giloprtuz]|om|p[ae-hk-nrtwy]|qa|r[eouw]|s[a-eg-ort-vyz]|t[cdf-hjkm-prtvwz]|u[agkmsyz]|v[aceginu]|w[fs]|y[etu]|z[admrw]|com|edu|net|org|mil|gov|biz|pro|aero|coop|info|name|int|museum)$/;

    if (!email.test(form[fieldName].value)) {

        return commonProcessFieldError(fieldName, errorCode);

    } else {

        return commonProcessFieldError(fieldName, null);

    }

}



// login



function logonEnableForm(params) {

    var form = params['form_id'];



    if (commonValidId(form)) {

        commonGet(form).onsubmit = function() {

            var errorField = null;

            if (!commonValidateRequired(this, 'username', 'error_1')) {

                errorField = (errorField ? errorField : 'username');

            }

            if (!commonValidateRequired(this, 'pass', 'error_1')) {

                errorField = (errorField ? errorField : 'pass');

            }

            if (errorField) {

                this[errorField].focus();

            }

            return !errorField;

        }

    }

}



// signup



function signupEnableSignupForm(params) {

    var form = params['form_id'];



    if (commonValidId(form)) {

        commonGet(form).onsubmit = function() {

            var errorField = null;

            if (!commonValidateRequired(this, 'username', 'error_1')) {

                errorField = (errorField ? errorField : 'username');

            } else if (!commonValidateMinLength(this, 'username', 3, 'error_2')) {

                errorField = (errorField ? errorField : 'username');

            } else if (!commonValidateSymbols(this, 'username', 'error_3')) {

                errorField = (errorField ? errorField : 'username');

            }

            if (!commonValidateRequired(this, 'pass', 'error_1')) {

                errorField = (errorField ? errorField : 'pass');

            } else if (!commonValidateMinLength(this, 'pass', 5, 'error_2')) {

                errorField = (errorField ? errorField : 'pass');

            }

//            if (!commonValidateRequired(this, 'pass2', 'error_1')) {
//
//                errorField = (errorField ? errorField : 'pass2');
//
//            } else if (!commonValidatePasswords(this, 'pass', 'pass2', 'error_2')) {
//
//                errorField = (errorField ? errorField : 'pass2');
//
//            }

            if (!commonValidateRequired(this, 'email', 'error_1')) {

                errorField = (errorField ? errorField : 'email');

            } else if (!commonValidateEmail(this, 'email', 'error_2')) {

                errorField = (errorField ? errorField : 'email');

            }

            if (errorField) {

                this[errorField].focus();

            }

            return !errorField;

        }

    }

}



function signupEnableReminderForm(params) {

    var form = params['form_id'];



    if (commonValidId(form)) {

        commonGet(form).onsubmit = function() {

            var errorField = null;

            if (!commonValidateRequired(this, 'email', 'error_1')) {

                errorField = (errorField ? errorField : 'email');

            } else if (!commonValidateEmail(this, 'email', 'error_2')) {

                errorField = (errorField ? errorField : 'email');

            }

            if (!commonValidateRequired(this, 'code', 'error_1')) {

                errorField = (errorField ? errorField : 'code');

            }

            if (errorField) {

                this[errorField].focus();

            }

            return !errorField;

        }

    }

}



// invite



function inviteFriendEnableForm(params) {

    var form = params['form_id'];



    if (commonValidId(form)) {

        commonGet(form).onsubmit = function() {

            var errorField = null;

            if (!commonValidateRequired(this, 'email', 'error_1')) {

                errorField = (errorField ? errorField : 'email');

            } else if (!commonValidateEmail(this, 'email', 'error_2')) {

                errorField = (errorField ? errorField : 'email');

            }

            if (!commonValidateRequired(this, 'message', 'error_1')) {

                errorField = (errorField ? errorField : 'message');

            }

            if (!commonValidateRequired(this, 'code', 'error_1')) {

                errorField = (errorField ? errorField : 'code');

            }

            if (errorField) {

                this[errorField].focus();

            }

            return !errorField;

        }

    }

}