Two white lines not supposed to apear in login page... WHY?

[auriaks]

Hi,
when I open this page in Firefox, it shows two white lines in left... Why this is happening?

http://www.laisvasprotas.xz.lt/login.php

Thanks.

[Snookerman]

I don't see any lines on Fx 3.6. Screenshot or better description?

[auriaks]

here it is