jQuery-validate error messages in Twitter bootstrap tooltips

At work, we're using the combination of ASP.NET MVC3, jQuery, jQuery-validate, knockout and Twitter Bootstrap on one of our projects. Having postponed looking at the aesthetics of the client-side validation for too long, we eventually found ourselves unsatisfied with the default error labels. Wanting to save on space, we're experimenting with the error messages being shown in a Twitter Bootstrap tooltip. After poking around for some while, I came up with something satisfactory.

In this example, I have a bootstrapped form that looks like this.

@using (Html.BeginForm("ChangePassword", "Account", FormMethod.Post, new { @class = "form-horizontal"})) {

    <div class="control-group">
        <label class="control-label">Old password</label>
        <div class="controls">
            @Html.PasswordFor(m => m.OldPassword)                            
        </div>       
    </div>
    <div class="control-group">
        <label class="control-label">New password</label>
        <div class="controls">
            @Html.PasswordFor(m => m.NewPassword)                
        </div>
    </div>
    <div class="control-group">
        <label class="control-label">Confirm password</label>
        <div class="controls">
            @Html.PasswordFor(m => m.ConfirmPassword)                
        </div>                            
    </div>  
    <div class="control-group">
        <div class="controls">
            <button type="submit" class="btn btn-primary">Change password</button>
        </div>
    </div>
}

To make the error messages show up in tooltips on the input controls, I eventually ended up with the snippet below.

$.validator.setDefaults({
    showErrors: function (errorMap, errorList) {
        this.defaultShowErrors();                            

        // destroy tooltips on valid elements                              
        $("." + this.settings.validClass)                    
            .tooltip("destroy");            

        // add/update tooltips 
        for (var i = 0; i < errorList.length; i++) {
            var error = errorList[i];
                         
            $("#" + error.element.id)
                .tooltip({ trigger: "focus" })
                .attr("data-original-title", error.message)                
        }
    }
});

I'm setting a custom showErrors function to extend the behaviour of the jQuery validator. I don't want to lose the default behaviour (highlighting etc), so I start with invoking the default showErrors function, to then destroy the tooltip on all valid input elements and to finally add or update the tooltip and its title on all invalid input elements. The errorList argument holds all the information I need for this; an array of invalid elements and their corresponding error messages.

[Object, Object]
> 0: Object
>> element: <input>
>> message: "The Current password field is required."
> 1: Object
>> element: <input>
>> message: "The New password field is required."
> length: 2

The end result looks like this.