Would this not be a case of MSPaint and Tables are your friends?
Unless I completely miss what your trying to achieve..
If I understand you want the boarder around the text box to be the silvery bar from the bottom of your header; being the case, then just create a table and then add it as a style="Background-src:url('link.jpg'); Background-repeat-x=1;"
just made a small version of the image of a pixel across then save it for the bottom and rotate 90 deg and save again. small pixel files load quickly. If you use a javascript you can force the page to preload everything first which speeds up the image loading as they have bandwidth priority, allowing it to link directly rather than search for the files it needs.
if not then i think you need a better explaination.