Header woes !

Argghhhhhhhh !

I get round to making the header and I must of tried 6 different sizes,using pixels,dpi etc,I've tried bigger and shrinking it when it's time to load but it just doesn't sit right.................it's either massive and across the page or it's this,what you see above.I don't mind if it sits in that box properly,which it isn't right now or really I'd like it completely over that box but I'm not happy with what it's doing right now and no idea why it's doing it ?

Any help would be greatly appreciated :)

Edited......Thanks Mel !