How I would do the menu. Remake the logo on the form of an old fashioned banner, ( old school isn't all bad! ) make it the background of a div of the same size and put the menu div inside it, floated right. Very stable arrangement since there's really only one thing in the 'box', the background doesn't count as inside.
Ways to protect images. Cover over them with a div with a high z-index, or a single pixel transparent gif, sized to cover them, also with a high z-index, or perhaps best is cover them with an .svg, which can be included in the page, and have its size set by the image size. You can even use it to put a phony watermerk over the image, even tilted to cover it.
Of course if someone really wants a particular image, and is knowledgeable, they will probably get it anyway. But this will stop the right click over the image to save it.
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