WP register form

Can anyone help me to extract the wp register form? My site is http://dev.bangchen.net On the top right, you can see two ugly links to register and signin/login, when you click on the login, you will see a popup which displays the wp login form, but i am having trouble generating the wp registration form.

I used <?php wp_login_form(); ?> to call the login form but couldn’t find the correct php to call the registration form.

Can anyone help?