function validate(form) {
                setTimeout(function() {
                    if (form == 'signup') {
                        if (validatedSignUp) {
                            return;
                        }
                        validateSignUp();
                    } else {
                        if (validatedLogin) {
                            return;
                        }
                        validateLogin();
                    }
                }, 300)
            }

            function validateSignUp() {
                $('#signup-form').validate({
                    rules: {
                        username: {
                            required: true,
                            rangelength: [3, 15],
                            remote: {
                                url: "ajax.php",
                                type: "post",
                                dataType: "json",
                                data: {
                                    func: 'check-user'
                                }
                            }
                        },
                        password: {
                            required: true,
                            minlength: 6
                        },
                        email: {
                            required: true,
                            email: true,
                            remote: {
                                url: "ajax.php",
                                type: "post",
                                data: {
                                    func: 'check-mail'
                                }
                            }
                        },
                        terms: {
                            required: true
                        }
                    },
                    errorPlacement: function() {},
                    highlight: function(element) {
                        $(element).closest('.form-group').addClass('has-error');
                        $(element).closest('.form-group').removeClass('has-success');
                    },
                    unhighlight: function(element) {
                        $(element).closest('.form-group').removeClass('has-error');
                        $(element).parents('.form-group').addClass('has-success');
                    },
                    errorElement: 'span',
                    errorClass: 'help-block',
                    validClass: 'has-success',
                    errorPlacement: function(error, element) {
                        if ($(element).attr('id') != 'terms') {
                            if (element.parent('.input-group').length) {
                                error.insertAfter(element.parent());
                            } else {
                                error.insertAfter(element);
                            }
                        }
                    },
                    messages: {
                        username: {
                            remote: 'Username already taken.'
                        },
                        email: {
                            remote: 'This email is in use.'
                        }
                    }
                });
            }