Can’t move replacement header image to top left

Hello,

I am using the unsleepable template on my blog, which is itself part of a larger website. I am trying to modify the header of my blog (www.alisharp.net/journal) so that the image starts in the very top left, rather than somewhere in the centre. I have been searching through the style.css for days now, and cannot find how to make the image move over. For reference, I want it to look like this: http://www.alisharp.net/home.htm

A side issue is that I am unsure the best way to embed the images that run along the top with links to different pages (in the /home.htm page). I coded the rest of my site in html, almost from scratch, so apologies if it seems a little messy.

So, they are my issues, I hope someone can help. 🙂