Yes I did put it in the correct file(at least I am sure I did), I putted in overall_header.html on my phpbb board. I deleted my cache.

But, now I am trying something else, I installed new template and will see how it works now.

Thx for support.

Edit: Well after installing new template it seems to work, I guess(but still nothing happens).
It sloooows my board down, but no checked links.
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