350554 Blogger Code

Very simple, have a blog and I want some code edits done. [login to view URL] Header : instead of the decription box with my header name, I want an image (you can just put blank image and I will change url) the size of 900px × 300px. Columns : I want three columns instead of two Aligned : I want the columns and the header aligned to the left so the background of palm trees still shows. I DO NOT WANT ANY WIDGETS OR ANYTHING TO CHANGE, NO OTHER SETTING TO CHANGE, COLORS, BACKGROUNDS EVERYTHING MUST STAY THE SAME, ONLY THE EDITS TO THE CODING.... THANKS