howdo I hide ad in header from login.php

[Trosun]

I'm using adsense. Tried to move it up on the header. Worked great. I can really se the CTR rising.
But as i'm grinding different forums i get this one post. 'bout some fella who did the same. But as a result, the ad showed up on the login page, therefore voilating theyr ToS.
So i would like to hide the ad on those pages.
Making my question:

How do i make 'text' inserted in header magically disappear on the login pages. (login.php i suppose) ?

[Trosun]

Hiding it from the search thingy would also be neat.