[jQuery] [validate] adding a loading indicator for remote method

[spetsacdc]

I was wondering if anyone could help me/get me pointed in the right
direction with making a loading gif come up when I am validating a
username with ajax.

I tried changing the class, but nothing happens. I changed this in the
validate.js file:

remote: function(value, element, param) {
                        var label = this.errorsFor( element );
                        label.html(" ").removeClass().addClass( "loading" 
);

doesn't work though.

Thanks