[YouTube-API] How to embed to have a HD playback by default ?

I have a youtube HD video in 1080x720 resolution that i've embedded to a web page.
I used the "hd=1" option as advised in here.

Still i get no HD selected by default.

-- What am I doing wrong?

Here is the embed line:

<iframe width="1080" height="750" src="http://www.youtube.com/embed/tGhouASeaKI?rel=0&hd=1" frameborder="0" allowfullscreen></iframe>

Here is the webpage with it:
http://www.promel.hr/images/videoPS/index.html

Any help appreciated!!!

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