Ryan has done a lot of graphics for me as well. I wrote his sales page for one of his sites at www.dressed2convert.com so we're good buddies and have worked together on a few projects.
If you're still having trouble getting your A/R code working with the graphics Ryan created for you drop me a PM and I'll help you out personally. One of my old sites used this technique exactly so I'm familiar with setting it up.
You just need to format your HTML so that the table for your A/R signup box is centered over top of the image you intend to use in the header graphic. This is done by basically toying around with the code until you get it all lined up properly.
I imagine Ryan probably wouldn't have a problem helping you out with this as he's a super nice guy and usually goes the extra mile for his customers, but if for some reason he won't do it let me know!