[xwiki-devs] Skin tutorial, custom logo?

Hello, Could you please consider writing a short tutorial on creating / modifying skins? For example, how to use a custom logo? Right now I'm trying to replace standard Toucan logo with my own with a couple links below it, I tried replacing <div id="companylogo"> fragment in global.vm, but I'm completely stuck with the css part. The logo and the links are there all right, but the layout is wrong. And I can't simply search-and-replace all 220s and 80s, because it's not a single picture but a table with 2 pictures and 5 links inside. I'd probably manage to do it by trial and error, but then I'd have no idea if it looks the same on other systems. It's probably easy, but my knowledge of css is rudimentary (basically I know what it is, how to apply it, and how to use it for fonts, sizes and colors; layouts are beyond me). It would be nice to have a basic tutorial like "if you want to replace the logo with your own picture enter it's size here, here and here, if you want to replace it with arbitrary html change this, this and this so the height of the logo area isn't hardcoded". Greetings, Lilianne