Technical help?

I'd like to customize my LJ layout a bit more, but I can't figure out how to do it. There must be someone out there who can help me! *bats eyelashes*

How do you put a permanent entry at the top of your LJ page so it looks like a banner?

ETA: Okay, what I apparently would like to do is add a banner to the top of my page. How hard is that to do?

Thanks to balfrog!!!