Stacking Divs

Hi! I’m not sure if this makes sense, I’ve been searching and I think the problem is that I don’t know the right words for what I’m looking for 😉 So my apologies if this has been asked before!

I am currently customising the Kubrick layout and I need an image to sit UNDERNEATH the sidebar table, which is semi-transparent.

My site is at http://www.L-Sketch.com – the little pirate on the right hand side is meant to sit partially under the archives list, as you can see she does on my other pages: http://www.l-sketch.com/animation/animation.html which are not powered by wordpress 🙂

In my experiece it’s usually just a matter of having your <DIV>s in the right order to make them do this, but I am new to PHP – I have tried including her in the header.php file, index.php, sidebar.php and footer.php and she has always been over the top no matter where I place the <DIV> (and sometimes the layout was just extremely broken ;))

What I’ve done is wrapped the whole thing in a relatively positioned DIV called “container” which allows me to position:absolute; elements inside it while still having the whole thing float left and right for different screen resolutions.

Any help would be much appreciated, thanks in advance!