Grrr, Arrg!

I'm having difficulties creating my new blog header. No matter what I do it comes out not sharp on the actual page (cause it's very sharp in my Photoshop). I made over 7 tests and I think I still need to make more! I've even scrapped my original and started from scratch! The final verison (as seen in my header) I've uploaded to an image hosting site and linked it to my blog. It looks a bit sharper than the direct upload from my computer.