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Hi Flipse,
is this the effect your trying to achieve?

I had a mess about with it in firebug to achive the overlapping effect. Mamba is correct you need z-index but remember an elevement(div) needs to be positioned relative or abosolute for z-index to work.
heres the code:
le="color: #000000"><?php .site_title { float: left; margin: 23px 0 0; position: relative; z-index: 1; }
le="color: #000000"><?php #xo-globalnav { clear: left; float: left; left: 0; margin-top: -10px; padding: 0; position: relative; top: 0; }
That should give the desired effect, you will probably need to tidy a couple of other things up, apart from that you hsould be good to go.