login register forgotpassord menu link

hello,
i'm using tao theme and best basic theme i ever seen.but there is one problem for me.
ait user login/register/Forgot Password page. i need to add unique id to this menu link for each ul li to customize it. becasue default ul class is links and this class is so widely using in theme. is there any easy way to add unique id for this register/login/forgot password menus?