This is a question that would be better asked in one of the forums that are for web design, like you mentioned, Dreamweaver. I'll move your post to the Dreamweaver forum.
if I understand you in the right way, so I would use Photoshop to build a single new image with the two, one positioned on the other. This image you can insert in your Dreamweaver or indicante a link to it.
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José, exporting a site design from Photoshop is a VERY poor way to get started with your website. The code written by this is 'brittle' in the sense that it can break if the browser viewport or text display size is not exactly the same as your Photoshop layout was at the time you exported the file.
To answer more specific questions about layout, we'd need to see an example of what you are trying to do.