Jquery Dropdown Login Plugin for Wordpress Header

I am in need of a twitter-styled jquery dropdown login plugin that can be embedded into the header of my wordpress theme ("Pinboard" by [login to view URL]) The user interface needs to be simple and clean, and should by responsive in design (i.e. mobile, desktop, etc). Logged out users should see two buttons: sign in & register, with the sign-in button functioning like this: [login to view URL] I DO NOT want the page to reload upon login. Upon login, users should see the login/register buttons change to display: their avatar (25px), followed by a button that displays their username, and then a logout button. When users hover over their username button, a dropdown menu of navigation list items should be displayed. I prefer to use wordpress menu editor to handle links in this part of the widget so that I can customize this menu easily from the backend.