Need help positioning flash photo gallery partially behind graphic.

I have created the basic photoshop layout that I will now be assembling in Dreamweaver.  I wish to create a 4 or 5 image gallery using LightBox 2 that will rotate images within the header graphic.  Image attached. How would I accomplish this code wise.  Would I place the arched graphic within it's own <div> and float it above the div that holds the slideshow/gallery?  Any help would be appreciated.