Facebook Connect Button

Hi there,

I used the below script I found here, but when clicking it opens up 5 windows of the same Facebook login screen.

Please see code below:

<div style="margin-top:-10px" id="new-fb-button"><img src="http://www.carthrottle.com/wp-content/uploads/2013/02/register.png" /></div>
<script>
(function ($) {
$(function () {
    $("#new-fb-button img").on("click", function () {
        FB.login(function(response) {
            if (response.authResponse) {
                _wdfb_notifyAndRedirect();
            }
        });
    });
});
})(jQuery);
</script>

And URL for the site:
http://www.carthrottle.com

Any help would be appreciated!